1040 Review Checklist: What the Reviewer Checks Before Sign-Off

Your Reviewer opens a drafted 1040 with a queue of others behind it, and the first decision is where to start. A finished return reads the same whether its figures are right or wrong, so a review can't be a read-through. It needs a route.

That's what a tax return review checklist is for. It puts the same checks in the same order on every file, so the Reviewer spends judgment on the figures that need it instead of rebuilding the folder. This piece lays out that route for an individual return: what to confirm before the review starts, how to tie figures to their sources, what to compare against last year, how to write review notes a preparer can clear, and what the sign-off should record. If you've been asking how to review a tax return without redoing it, start here. The checklist supports your Reviewer's judgment. It doesn't replace it.

Before the review starts

Two questions come before any figure, so ask them first.

Is the folder complete

Put last year's return next to this year's folder. Every income source on last year's return should have this year's document, or a note that says why it doesn't: the account closed, the job ended, the client sold the rental. A missing document nobody noticed tends to surface late, after the figures it affects are drafted, and then the work gets done twice.

Two more checks while the folder is open. Wrong-year documents are set aside, not drafted; a prior-year 1099 that slipped into the folder gets marked and left out. Multi-page statements have every page, and a brokerage statement with a page missing is flagged instead of drafted around. Ideally the preparer has run these checks already, in a self-review before the file reaches the Reviewer. The Reviewer confirms them anyway.

Open client items

Some items will still be open when the file reaches review. That's normal. What matters is whether each one is written down: what's missing, who asked the client and when, and which figures on the return it affects.

An open item that affects no figure is a note for the file. An open item that touches a drafted figure is a decision for the Reviewer: sign around it with a note on the record, or hold the return until the document arrives. If open items live in someone's inbox instead of on the file, send the file back before reviewing a single figure. A client request list built at triage keeps them where the Reviewer can see them.

Source ties

Each figure on the draft should point to a document, a page, and the value printed there. Where a document prints a total, the detail behind it should tie to that total, and the tie-out should be shown on the file, not asserted. A figure with no pointer leaves the Reviewer two options, trust it or go find the source, and neither belongs in a review. Send it back.

Read each figure against its page, in order. Our piece on the Reviewer's readback covers the reading itself, and tying out extracted totals covers the arithmetic. The lists below name what to tie on a typical individual return for tax year 2025. They name forms, schedules and boxes only. The current-year IRS instructions govern where each figure goes, and your preparer and Reviewer make the treatment calls.

Income

• Wages. Box 1 of every W-2 in the folder ties to the wages on the return.
• Interest and dividends. Each 1099-INT and 1099-DIV ties to its page, with Schedule B if required. On a composite brokerage statement, ordinary dividends (1099-DIV Box 1a) and qualified dividends (Box 1b) tie to the statement's 1099-DIV section, and the detail pages tie to those totals.
• Sales of securities. 1099-B detail carries to Form 8949 and Schedule D, as the instructions require. Basis is checked against the statement or the client's records, and any adjustment has a reason on the file.
• Retirement distributions. Each 1099-R's gross distribution (Box 1) and taxable amount (Box 2a) tie to the return, and the distribution code in Box 7 has been read, not skipped. The code bears on how the distribution is treated.
• Social Security. Net benefits from each SSA-1099 (Box 5) tie to the return.
• Pass-through income. Each K-1 ties to the return: pass-through income on Schedule E, and any other items to the forms the instructions name. Every K-1 the client expected is in the folder.
• Business income. Schedule C gross receipts are reconciled to the client's books and to any 1099-NEC and 1099-K forms in the folder. They won't always match, so the difference gets a one-line explanation on the file.

Deductions

• Itemized or standard. The choice was made with the whole return in view, not defaulted. The Reviewer checks that the comparison exists; the preparer owns it.
• Mortgage interest. Each 1098 (Box 1) ties to its page, and the interest carried to the return is reconciled to it, with any difference explained.
• State and local taxes. Property tax ties to the bill and to proof of payment, not to the bill alone.
• Charity. Each contribution ties to the acknowledgment or receipt in the folder.
• Adjustments to income. Each one ties to its document, such as a 1098-E for student loan interest, or Forms 5498-SA and 1099-SA behind Form 8889.

Credits and payments

• Withholding. Federal income tax withheld on each W-2 (Box 2), and on any 1099 or SSA-1099 that shows withholding, ties to the payments on the return.
• Estimated payments. Each payment ties to a confirmation. Any overpayment applied from last year's return matches that return, and any IRS notice that changed it.
• Credits. Each credit traces to its source document: the dependent care provider statement to Form 2441, the 1098-T to Form 8863, the 1095-A to Form 8962.

Prior-year changes

Put last year's return beside this year's draft. Much of an individual return recurs from one year to the next, so the changes are where the questions live. Our piece on prior-year comparison shows how to build the comparison; here's what the Reviewer looks for in it.

What moved

• Swings. A recurring figure that moved sharply has a one-line reason on the file. "Higher than last year" restates the number. "Second job started in June" explains it.
• Status and household. Filing status, dependents and address match what the client told you this year. A marriage, a divorce or a death can change filing status and more besides.
• Dependents. A dependent's age or situation changed since last year, which can change which credits apply. Flag it for the preparer instead of carrying last year's answer forward.
• Carryovers. Carryovers shown on last year's return, a capital loss carryover for example, are carried into this year, or the file says why not.

What is new

• New items. A new income source, a new state, a new entity, a property sale: each one has its document and a note on how it was treated.
• Dropped items. Anything on last year's return that's missing from this year's draft has been asked about or explained. A closed account is fine once someone has confirmed it closed.

Review notes a preparer can clear

A review note helps only if the preparer can act on it without walking over to ask what it means. "Check this" and "doesn't look right" send the question back and add a round trip. Our piece on send-back notes a preparer can clear covers the format in full; here it is applied to a 1040.

Note format

Every note has four parts:

1. What. An observation, not a verdict: what you saw, in one sentence.
2. Where. The figure's reference, the document, and the page.
3. Expected fix. What would clear the note: a corrected value, a document, or a reason on the file.
4. Cleared by. The preparer's initials, the date, and what changed.

Here are templates to copy. Bracketed text is what you fill in.

Source tie. [Figure ref] shows [drafted value]; [document], page [n], prints [printed value]. Expected fix: correct the figure to the page, or note why the page doesn't govern. Cleared by: [initials, date, what changed].

No source. [Figure ref] has no pointer to a document or page. Expected fix: add the document and page, or take the figure out. Cleared by: [initials, date, what changed].

Missing page. [Document] is missing page [n] of [total], and [figure ref] depends on it. Expected fix: request the page and re-run the tie-out when it arrives, or record it as an open item. Cleared by: [initials, date, what changed].

Treatment changed. [Item] was treated as [last year's treatment] last year and as [this year's treatment] on this draft, with no reason on the file. Expected fix: a one-line reason for the change, or a correction. Cleared by: [initials, date, what changed].

Open item touches a figure. [Open item] is still with the client and affects [figure ref]. Expected fix: confirm it's on the request list and mark the figure as pending, so I can decide whether to sign around it. Cleared by: [initials, date, what changed].

Carryover not carried. Last year's return shows [carryover]; this draft doesn't carry it. Expected fix: carry it, or note why it no longer applies. Cleared by: [initials, date, what changed].

Payments don't tie. Payments on the draft total [drafted value]; the documents in the folder total [document total]. Expected fix: find the difference and correct it, or note the document that explains it. Cleared by: [initials, date, what changed].

Send-back rules

Decide once, as a firm, what goes back to the preparer and what the Reviewer fixes, and write it down. One workable split:

• Send back: any figure without a source, any tie that fails, any change from last year without a reason, and any open item that touches a figure without a note.
• Fix and record: a typo or transposed digit the Reviewer can see on the page, corrected with a note saying what changed, so the record still shows it.
• Note for next year: anything that doesn't change this return but should change how next year's file is built.

Keep every note with the file, cleared or not. At the end of the season, those notes show where your process breaks, and the season-end send-back review shows how to sort them by cause.

Sign-off

The Reviewer concludes and signs. The checklist organizes the review, and the Reviewer makes the call.

What the Reviewer records

What the sign-off should leave behind is a record someone can read later:

• who reviewed the return, and when;
• which version of the draft they reviewed;
• the notes they sent, and how each one was cleared;
• any open item they signed around, and why.

That record lets a partner, a successor, or the same Reviewer next year see what was checked without asking. Our piece on the sign-off packet shows a one-page version, and the Reviewer sign-off page covers this step in TracePrep.

The 1040 pre-sign-off checklist

Here's the whole route on one page. Copy it into your review template and adjust it to your firm's own rules.

Kept to one page, this 1040 review checklist stays the same from file to file and from Reviewer to Reviewer. Your Reviewer's judgment still decides the return.

Where TracePrep fits

TracePrep is tax-prep software for CPA and EA firms. What it aims to hand you is a return draft ready for your own Reviewer to review, with each figure traced to its source document and missing items already asked. The plugin drafts; the Firm's preparer prepares; the Reviewer signs off. Access to the plugin is by waitlist. The Reviewer's side is on the for Reviewers page.

Run the same route on the next file

Pick the next drafted 1040 in the queue and run the route in order: folder, open items, source ties, prior year, notes, sign-off. Send back only notes a preparer can clear. Written down, the route becomes your firm's tax return review process, and preparers can build files to meet it. When you want to see return drafts with a source on every figure, join the TracePrep waitlist.

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Not tax advice. TracePrep is a software product from TracePrep Inc., not a CPA firm. This content is operator experience for educational purposes; it is not tax advice and has not been reviewed by a licensed CPA. Consult a qualified tax professional for guidance on your specific situation. Source citations in TracePrep workpapers support audit defense but do not guarantee IRS outcomes.