Version v3, none of our changes applied yetStage Review
Actions are recorded as the role you choose. There is no sign-in in this demo, so pick the person whose view you want.
Story time 23 Jun 2026, 06:05 UTC
Viewing as Jo Kimura, firm administratorAdministrator: views, time and filing; return values are read only.

About this workspace

Demo

Taxmark is a web-native workpaper for one household's 2025 return: click any number to see the page and field it came from, the rule that built it, who checked it and what is still open.

74 documents3,012 values read from them3 computed versions627 lines on v329 events in the timeline

Try: open Checks as Daniel, click California estimates, then switch role in “Viewing as” to see what each person may see and do.

Every action is saved as an event in this workspace (/w/gwxn6k5xxe); open the root link again for a clean copy. Anything not in the packet is tagged Example.

Legends

  • Blockingstops filing
  • Check failedour check disagrees
  • Judgmentneeds a recorded decision
  • Engine warningfrom the engine only
  • Notea finding for information; nothing to act on
  • No open checksnothing open on this line
  • Adjustedchanged in this workspace
  • Proposedan adjustment waiting for a reviewer to apply it
  • Swingmoved past the firm’s variance rule from last year
  • New this yearno amount last year
  • Signeda sign-off covers this value
  • Stalethe value changed after it was signed
  • As filed, lockedaccepted by the agency; later work attaches on top
  • Examplenot in the packet: an illustration

Pills on Checks

  • Blockeran open item that stops partner approval: a problem our check found, or a line waiting for the engine to re-run
  • Opena blocker still open when the return was signed or filed
  • Checkour check disagrees; it does not stop approval
  • Judgmentour check needs a recorded decision
  • Infoour check notes it; nothing to act on
  • AIthe AI agent flagged this item; a person accepts or dismisses each suggestion
  • Needs reviewan AI suggestion no one has decided yet (Accepted once someone has)
  • Engine warningthe engine’s own warning names this item, quoted as it wrote it; not one of our checks
  • Confident mistakeflagged by our checks, though every value behind it was read at 0.95 or above. The checks were built from the mistakes our external investigation found.
  • Clearedclosed with a reason, or by an adjustment (Adjusted)
  • Signed offa sign-off covers this finding

Deadlines on the story clock

15 Apr 2026Federal Form 1040 and California 540NR - original due datePassed 70 days ago
15 Oct 2026Extended due date (federal and California)In 113 days
27 Mar 2026Internal: preparer hand-off to reviewPassed 89 days ago
08 Apr 2026Internal: review completePassed 77 days ago
15 Oct 2026FinCEN 114 (FBAR) automatic extended due date (outside engagement)In 113 days
02 Feb 2026Forms 1099-NEC for 2025 contractor payments (late; outside engagement)Passed 142 days ago

Firm standards

A starting point. Applicants may change, extend or replace these through the firm administrator role.
Rules (7)
“A person may not review or sign off on work they prepared.”Review: sign-off disabled on your own adjustment
“Any adjustment with a tax effect over 1,000 (federal or state) requires partner sign-off.”Review: partner items; approval waits for them
“Every judgment call records the authority relied on.”Drawer: decisions record their authority
“Due diligence must be documented for the child tax credit, credit for other dependents, American opportunity credit, earned income credit and head of household status.”Drawer: due diligence decisions
“Open review notes block filing.”Review: blocking notes stop approval
“Staff without sensitive-data clearance see SSNs, bank and account numbers and IP PINs masked; every unmasked view is logged.”Everywhere: last 4 only; reveals logged on Review, View log
“Records are retained 7 years after filing, then destroyed.”Filing: the as-filed record is locked, not deleted
The 12 required steps
  1. Engagement letter and consents signed
  2. Identity verified
  3. Prior-year return reviewed
  4. All documents accounted for
  5. Prior-year variances explained
  6. Carryovers agreed to prior year
  7. Estimated payments agreed to IRS and FTB records
  8. Due diligence completed
  9. Diagnostics resolved
  10. Reviewer sign-off
  11. Partner sign-off
  12. Client approval and e-file authorization
Verification types
  • Agreed to source document
  • Recalculated
  • Confirmed with client
  • Agreed to prior year
  • Agreed to third party record
Review levelsPreparer, Reviewer, Partner
Variance reviewCompare to Prior year; flag when the change is over 10% and over 1,000.

People and clearance

NameRoleCredentialSensitive dataActive fromNote
Priya RamanPreparerCleared01 Aug 2025
Daniel OrtizReviewerCPACleared04 Jan 2021
Helen StrandPartnerCPACleared01 May 2018
Marcus BellPreparerNo clearance24 Mar 2026Background check pending; no access to full SSNs or bank numbers.
Jo KimuraFirm administratorCleared10 Feb 2020
Sam AdeyemiQuality reviewerCPACleared04 Jan 2027 Later
Ngozi OkaforClientOwn items only
Erik LindqvistClientOwn items only

Assignment at the start: Preparer Priya Raman · Reviewer Daniel Ortiz · Partner Helen Strand

Time against budget

AreaBudget (h)Logged (h)Left (h)Status
Intake and engagement1.501.5None logged
Wages and stock compensation303None logged
Investments and digital assets404None logged
Business3.503.5None logged
Rentals and sale3.503.5None logged
Pass throughs and basis202None logged
Deductions and credits202None logged
California1.501.5None logged
Partner review101None logged
Total22022

Budget from the packet. Logged time is what people record in this workspace; the packet has no time records.

How AI was used

The mistakes our checks catch were found during an AI-assisted review of the packet and are now caught by deterministic checks.

An AI agent investigated the whole packet with the app’s own tools, identifiers masked, and suggested issues with quotes. Its suggestions appear only on the final computed version, after each quote is found on its page, and a person accepts or dismisses each one.

ChecksAs of 23 Jun 2026, 06:05 UTC 11 blockers 29 items open 1 later in the story

Checks inbox

Items (14)

BlockerCheckJudgmentInfoour rule checks;AIthe AI agent flagged this item, a person decides;Engine warningthe engine's own note names this item;Confident mistake flagged by our checks, though every value behind it was read at 0.95 or above. The checks were built from the mistakes our external investigation found.

StatusWhatAmountTax effect
Check
CheckConfident mistake
Provider tax ID misread on Little Sprouts Learning Center - 2025 statement (Theo)F2441.1b

The page prints 74-3829156; the pipeline read 74-3829516 at confidence 0.97. The digits are transposed, and F2441.1b carries the wrong number.

EvidenceProvider tax ID (D62, page 1)Our check CHK-PRINTED-VS-READ · Two sources disagree
4,200
CheckConfident mistake
F2441.1a names "Bright Oak Preschool"; the document says "Bright Oak Kids Club"F2441.1a

The line's party name "Bright Oak Preschool" appears nowhere on Bright Oak Kids Club - 2025 statement (Theo), which is issued by Bright Oak Kids Club under tax ID 68-0412257. The tax ID is right; the name on the form should match the document.

EvidenceProvider tax ID (D61, page 1)Total paid (D61, page 1)Our check CHK-LABEL-VS-DOCUMENT · Two sources disagree
5,400
CheckAIConfident mistake
Lone Star Kids Auto Donation - 2012 Subaru Outback (VIN 4S4BRBCC2C3209921): 6,000 from the client's estimate, 2,900 on the 1098-CF8283.A1.vehicle · 1 AI suggestion

F8283.A1.vehicle takes 6,000 from the client's answer ("Donated stock to our donor-advised fund in December, and donated our old Subaru in August - Kelley Blue Book said about 6,000."). 2025 Form 1098-C - Lone Star Kids Auto Donation (2012 Subaru Outback) reports box 4c gross proceeds from sale 2,900. When the third-party form fixes the amount, the return uses it.

EvidenceQuestionnaire: Charitable: non-cash giftsBox 4c gross proceeds from sale (D66, page 1)Our check CHK-CLIENT-VALUE-VS-DOCUMENT · Two sources disagree
Needs review✦Lone Star Kids Auto Donation - 2012 Subaru Outback (VIN 4S4BRBCC2C3209921), 6,000: A deduction or credit that may exceed a limit

A donated vehicle the charity sold is limited to the gross proceeds on Form 1098-C, not the Kelley Blue Book value the client gave.

Evidence2025 Form 1098-C - Lone Star Kids Auto Donation (2012 Subaru Outback), page 1
6,000Fed +806 · CA +149 estimate
CheckAIConfident mistake
Interest - Northlake Bank, N.A. repeats Interest - Northlake Securities - bank sweep (composite 1099-INT)SchB.1.2 · 1 AI suggestion

Two lines report 1,840 each, from two documents that print the same account (ending 7731). One payment shown on two forms is one line of income; SchB.1.2 counts it again.

Evidence1099-INT box 1 interest (Northlake Bank sweep) (D28, page 1)Box 1 interest income (D29, page 1)Our check CHK-DUP-PAYER · Value counted twice
Needs review✦Interest - Northlake Bank, N.A., 1,840: double counted interest

The standalone Form 1099-INT reports the same sweep interest already on the composite statement, so the interest is counted twice.

Evidence2025 Form 1099-INT - Northlake Bank, page 1Northlake Securities 2025 consolidated Form 1099 (Ngozi Okafor), page 1
1,840Fed -640 · CA -127 estimate
CheckAIConfident mistake
Vehicle mileage log 2025 (scanned, 4 pages): page 3 repeats page 2SchC.44a · 1 AI suggestion

Every value read from page 3 (89 values) matches page 2, so it is the same sheet twice. SchC.44a adds both pages, counting 3,700 twice, which flows into SchC.9.

EvidenceVehicle mileage log 2025 (scanned, 4 pages), page 2Page total miles (D23, page 3)Our check CHK-DUP-PAGE · Value counted twice
Needs review✦Business miles (Part IV), 11,800: duplicate page counted

Business miles add the page total from a second scan of the same May-August sheet, overstating miles and the standard mileage deduction.

EvidenceVehicle mileage log 2025 (scanned, 4 pages), page 3
11,800Fed +919 · CA +80 estimate
CheckAIConfident mistake
Home mortgage interest and points reported on Form 1098: the payoff statement is added on top of the Form 1098 that includes itSchA.8a · 1 AI suggestion

SchA.8a includes 2,150 from the payoff statement as a separate amount, but that statement says it is reported on the Form 1098. The same 2,150 is counted twice.

EvidenceInterest to payoff (D56, page 1)Box 1 mortgage interest (D55, page 1)Box 6 points paid on purchase (D55, page 1)Our check CHK-DUP-LENDER-STATEMENT · Value counted twice
Needs review✦Home mortgage interest and points reported on Form 1098, 21,847: double counted interest

Payoff interest is already in the Form 1098 box 1 total, so adding the payoff statement interest counts it twice.

Evidence2025 Form 1098 - Lonestar Mortgage (home, July-November), page 1Lonestar Mortgage payoff statement (11/20/2025), page 1
21,847Fed +559 · CA +103 estimate
CheckAIConfident mistake
2025 estimated tax payments: 13,000 on the return, 12,000 on the IRS account transcriptF1040.26 · 1 AI suggestion

F1040.26 claims 13,000; the IRS account transcript credits 12,000 of estimated payments to tax year 2025. Part of the line rests only on a client answer (qa-41), never reconciled to the agency. The return overstates payments by 1,000.

EvidenceEstimated payment 2025-04-15 (D67, page 1)Payment date 1 (D67, page 1)Estimated payment 2025-06-16 (D67, page 1)Payment date 2 (D67, page 1)Estimated payment 2025-09-15 (D67, page 1)Payment date 3 (D67, page 1)Questionnaire: Federal estimated payment for the 4th quarter: date and amountAgency record: IRS account transcript 2025, #1Our check CHK-PAYMENTS-VS-AGENCY · Tie-out to agency record
Needs review✦2025 estimated tax payments, 13,000: something in a document the return does not reflect

Fourth-quarter payment taken from the client's guess of 4,000; the IRS transcript shows 3,000 on 2026-01-15, so estimated payments are overstated.

EvidenceEFTPS payment confirmations (2025 estimated tax), page 1
13,000Fed +1,000 estimate
CheckAIConfident mistake
Interest - Sparbanken Norrland (SEK 18,450.00 at 10.56 SEK/USD): converted at the 2024 average rate, not the 2025 averageSchB.1.6 · 1 AI suggestion

SEK 18,450 of 2025 income was converted at 10.56 (2024_average). Income uses the tax year's average rate, 9.86 (2025_average), which gives 1,871, a change of 124.

EvidenceInterest credited (SEK) (D36, page 1)fx.SEK.2024_averagefx.SEK.2025_averageOur check CHK-FX-RATE-YEAR · Field the rule ignores
Needs review✦Interest - Sparbanken Norrland (SEK 18,450.00 at 10.56 SEK/USD), 1,747: A payment or event that may sit in the wrong year

2025 Swedish interest was converted at the 2024 average rate; at the 2025 average rate it is about 1,871 dollars, not 1,747.

EvidenceSparbanken Norrland - 2025 year-end statement (Swedish, SEK), page 1
1,747Fed +43 · CA +9 estimate
CheckConfident mistake
Penalty (regular method) leaves out excess social security tax as withholdingF2210.19

The penalty treats 25,400 as withholding. Excess social security tax (Sch3.11, 3,342) counts as withholding too. Recomputing the regular method (installments of 10,328, 7.000000000000001% to 2026-04-15) reproduces the engine's 164 with 25,400, and gives 17 with 28,742.

EvidenceBox 4 social security tax withheld (D08, page 1)Box 4 social security tax withheld (D09, page 1)Employer name (D08, page 1)Employer name (D09, page 1)fed_underpayment_rateOur check CHK-PENALTY-WITHHOLDING · Field the rule ignores
164Fed -147 estimate
CheckConfident mistake
Credit for net income tax paid to Oregon (composite, resident-period share) is not limited to California's tax on that incomeScheduleS.credit

ScheduleS.credit = 1,580 other-state tax x 195/365 = 844. The credit is limited to California's own tax on the double-taxed income: 9,830 / California AGI 305,349 x regular tax 19,718 = about 635. Credit overstated by about 209; attach the statement for the composite return.

EvidenceOregon composite tax paid for shareholder (D39, page 2)Box 1 ordinary business income (D39, page 1)ca_resident_daysyear_daysOur check CHK-OTHER-STATE-CREDIT-LIMIT · Limit or cap
844CA +209 estimate
Check
Prior preparer's open item never resolved: 2023 Form 3520 (foreign inheritance over 100,000)D07

The prior preparer left "2023 Form 3520 (foreign inheritance over 100,000) - discussed? (no note of resolution)". No document, answer or diagnostic in this engagement resolves it, though D36, qa-07 mention the same fact. Carry it as a tracked item with an owner and a resolution.

EvidencePrior year: Prior preparer workpaper, Open items left by prior preparer, #42024 workpaper file from prior preparer (export)Sparbanken Norrland - 2025 year-end statement (Swedish, SEK)Questionnaire: Did you have any foreign bank accounts or assets?Our check CHK-PRIOR-OPEN-ITEM · Open item never closed
CheckEngine warningConfident mistake
Meridian Brokerage 2025 consolidated Form 1099 - CORRECTED (joint): page 32 never read, yet the return uses it as completeD31

The extraction is partial (Page 32 ('Additional transactions') was not read by the pipeline.). The unread page prints 1 more sale(s) with proceeds 250.00 that no return line carries. Summary proceeds less the extracted lots leave a gap of 250, exactly the unread sales.

EvidenceMeridian Brokerage 2025 consolidated Form 1099 - CORRECTED (joint), page 321099-B summary total proceeds (D31, page 1)Our check CHK-UNREAD-PAGE · Blank read used as zero
The engine's own note on this itemwarningBROKER_SUMMARY_DETAIL_MISMATCHMeridian 1099-B summary proceeds 71,965.00 differ from the sum of extracted lots 71,715.00.
Fed -21 estimate
CheckAIConfident mistake
Mixed-use expenses deducted at 100% although the client gave a business shareSchC.25 · 2 AI suggestions

The call notes give the business share: Telephone 2,160: 70% business; Internet 1,320: 50% business; Software and subscriptions 216: personal. SchC.25 and SchC.27a.1 still deduct the full amounts. Personal part: 1,524.

EvidenceCall notes 2026-03-26Telephone (D14, page 1)Internet (D14, page 1)Software and subscriptions (D14, page 1)Spotify Family (D15, page 1)Our check CHK-BUSINESS-SHARE-FROM-NOTES · Client answer vs line
Needs review✦Utilities (telephone and internet), 3,480: A business-use share that differs from what the client said

The family phone plan and shared home internet are deducted in full; the client estimates business use at about 70% and 50%.

EvidenceLindqvist Studio - transaction detail for selected accounts, page 2
Needs review✦Other expenses - software and subscriptions, 6,850: personal expense deducted

The family music subscription is personal and was booked to software by mistake, so it should come out of business expenses.

EvidenceLindqvist Studio - transaction detail for selected accounts, page 1
3,480Fed +541 · CA +47 estimate
CheckEngine warningConfident mistake
2024 return claimed 300 sq ft for the Sacramento office; the client measured 220D06

The 2024 SchC.30 used 300 sq ft (Home office (simplified, 300 sq ft) Simplified method, 300 sq ft.). The same room measures 220 sq ft (Home office measurements (client note)). The prior year looks wrong, not this year; about 400 of 2024 deduction was overstated. Record it and tell the client; too small to amend alone.

EvidencePrior year: Return 2024, Lines, SchC.302024 Home office (simplified, 300 sq ft) (D06, page 5)Sacramento office square feet (D24, page 1)Our check CHK-PRIOR-YEAR-FIGURE · Prior year vs documents
The engine's own note on this iteminfoHOME_OFFICE_AREA_CHANGEHome office area (average 240 sq ft) differs from 2024 (300 sq ft).

Firm administrator does not sign off work.

19 AI suggestions on 18 items (some items carry more than one); open a row to see each one.

An AI agent investigated the whole packet with the app’s own tools, identifiers masked, and suggested issues with quotes. Its suggestions appear only on the final computed version, after each quote is found on its page, and a person accepts or dismisses each one. The mistakes our checks catch were found during an AI-assisted review of the packet and are now caught by deterministic checks.

From the engine (11, v3)

The engine’s own diagnostics, shown as it reported them. They are not our checks and are not counted as findings.

warningDIGITAL_ASSET_BASIS_MISSINGCoinhaven lot C6 has no cost basis (transfer in from external wallet). Engine used zero basis and the transfer-in date.EvidenceC6 digital asset (D34, page 1)C6 date sold (D34, page 1)C6 gross proceeds (D34, page 1)C6 date acquired (D35, page 1)C6 cost basis (D35, page 1)Named by an AI suggestion (not one of our checks): BTC 0.05 units (acquired 2025-06-01, sold 2025-06-18; proceeds 5,325.00, basis 0.00), 5,325: A client answer that conflicts with the return
infoAMT_CREDIT_CARRYFORWARDAMT arises from the incentive stock option exercise (a deferral item); a minimum tax credit carryforward to 2026 is expected (Form 8801 next year).EvidenceAlternative minimum tax (F6251.11)Not covered by our checks
infoAOTC_PHASED_OUTAmerican opportunity credit fully phased out by modified AGI.EvidenceAOTC after phase-out (F8863.7)Not covered by our checks
infoFBAR_OUTSIDE_RETURNForeign account maximum exceeds 10,000 USD: FinCEN Form 114 (FBAR) is due separately (not part of this return; not in engagement scope).EvidenceForeign deposit account - maximum value (USD at 12/31 Treasury rate) (F8938.1.max)Not covered by our checks
warningFORM_1099_FILINGSchedule C: client paid two contractors 600 or more and has not filed Forms 1099-NEC.EvidenceMade payments requiring Forms 1099 (SchC.I)Filed or will file required Forms 1099 (SchC.J)Not covered by our checks
warningDUE_DILIGENCE_REQUIREDForm 8867 must be completed by the preparer for the child tax credit and credit for other dependents.EvidencePaid preparer due diligence checklist (CTC/ODC claimed) (F8867.status)Not covered by our checks
warningCA_AMT_NOT_COMPUTEDCalifornia AMT (Schedule P 540NR) not computed: review incentive stock option exercise for California-source allocation.EvidenceIncentive stock options (F6251.2i)Covered by our check: Alternative minimum tax (Schedule P): never computed, though its input carries an amount
warningQUESTIONNAIRE_SALES_CONFLICTQuestionnaire answer: no investments sold. Documents show 282 brokerage sales and 12 digital asset dispositions.EvidenceQuestionnaire: Did you sell any stocks, bonds, mutual funds or other investments in 2025?Not covered by our checks
warningLOW_CONFIDENCE_READHandwritten receipt amount read with low confidence (0.41).EvidenceCash gift amount (D64, page 1)Not covered by our checks
warningBROKER_SUMMARY_DETAIL_MISMATCHMeridian 1099-B summary proceeds 71,965.00 differ from the sum of extracted lots 71,715.00.Evidence1099-B summary total proceeds (D31, page 1)Covered by our check: Meridian Brokerage 2025 consolidated Form 1099 - CORRECTED (joint): page 32 never read, yet the return uses it as complete