How to Read Tax Returns in Divorce

By DivorceAudit.com Editorial Team | Reviewed for Accuracy by the DivorceAudit.com Editorial Review Team

Published: August 1, 2026 | Last Updated: August 1, 2026

This article contains affiliate links. If you make a purchase, we may earn a commission at no additional cost to you. See our Affiliate Disclosure for details.

Introduction

Tax returns are one of the most valuable documents in divorce financial disclosure. They are prepared under penalty of perjury, cover a defined period, and reference nearly every category of income and many categories of assets. For these reasons, they are a required disclosure item in most divorces and a starting point for verifying what a spouse has reported elsewhere.

Reading a tax return effectively means knowing which schedules and forms to look at, what each one reveals, and how to spot details that may point to income or assets not otherwise disclosed. This article walks through the key sections of a federal tax return and what to look for in each.

Form 1040 — the starting point

Form 1040 is the main federal individual tax return. It summarizes total income, deductions, and tax owed, and references the various schedules that provide supporting detail. Key lines to review on Form 1040 include wages, interest and dividend income, business income, capital gains, rental income, and total income.

If the return is filed jointly, the income reported reflects both spouses combined, which means the return alone will not isolate one spouse’s income without further analysis. If returns were filed separately or if only one spouse’s information is in question, reviewing several years of returns side by side can reveal trends — including any sudden changes in reported income around the time of separation.

Schedule B — interest and dividend income

Schedule B lists interest and dividend income by the name of the paying institution. This is one of the most useful schedules for identifying financial accounts that may not have been otherwise disclosed. Every institution listed on Schedule B should correspond to an account disclosed on the financial affidavit. An institution that appears on Schedule B but not in the financial disclosure points directly to an account that needs to be accounted for.

Schedule C — business income

Schedule C is used by sole proprietors and single-member LLC owners to report business income and expenses. It is one of the most important schedules to review when a spouse is self-employed, because it shows both revenue and the deductions taken against it.

When reviewing Schedule C, look at the trend in reported revenue and net profit over several years. A significant and unexplained decline around the time of separation may indicate that income is being understated. Also look at the categories of expenses claimed — unusually large deductions for items such as vehicles, travel, or meals can sometimes reflect personal expenses being run through the business, which has the effect of reducing reported income without reducing the owner’s actual financial benefit.

Schedule D and Form 8949 — capital gains and investment sales

Schedule D summarizes capital gains and losses, while Form 8949 provides line-by-line detail of individual securities transactions, including the name of the brokerage or institution involved. Together these forms reveal investment account activity during the tax year.

Any brokerage or investment platform named on Form 8949 should correspond to a disclosed investment account. If a transaction references an institution that has not been disclosed, that is a specific, documented gap that can be pursued through discovery. See our article on how to find hidden investment accounts in divorce.

Schedule E — rental and pass-through income

Schedule E reports income and expenses from rental real estate, royalties, partnerships, S corporations, estates, and trusts. For real estate, it lists the address of each rental property — making it one of the most direct ways to identify property that generates income but may not appear in the financial affidavit.

For business owners with an interest in a partnership or S corporation, Schedule E reports the pass-through income reported on the corresponding Schedule K-1. Any business entity or property referenced on Schedule E that does not match a disclosed asset is a specific item to raise. See our article on how to find hidden real estate in divorce.

Schedule K-1 — partnership, S corporation, and trust income

A Schedule K-1 is issued to partners, S corporation shareholders, and trust beneficiaries, reporting their share of the entity’s income, deductions, and credits. K-1 income is a significant source of income for many business owners and trust beneficiaries, and it is sometimes overlooked in financial disclosure because it does not arrive in the same way as a regular paycheck.

If a tax return references a K-1 from an entity that has not been disclosed — a business interest, a partnership, or a trust — that is a specific gap that should be raised. See our article on hidden assets and trusts in divorce for more on how trust-related income appears on tax returns.

Schedule A — itemized deductions

Schedule A lists itemized deductions, including mortgage interest, state and local taxes, and charitable contributions. The mortgage interest deduction is particularly useful in identifying real estate — if the deduction claimed appears larger than what the known properties would generate, that may point to an additional mortgage on an undisclosed property.

Form 8949 and 1099 forms — cross-referencing

Beyond the schedules attached to the return itself, the various 1099 forms a taxpayer receives — 1099-B for brokerage transactions, 1099-DIV for dividends, 1099-INT for interest, 1099-MISC and 1099-NEC for other income — each identify the issuing institution. Comparing the full set of 1099 forms received against the financial affidavit is one of the most effective ways to confirm that all financial accounts and income sources have been disclosed.

Comparing returns across multiple years

Reviewing a single year’s tax return provides a snapshot, but reviewing several years together often reveals more. Look for the following patterns when comparing returns across years.

A sudden drop in income around the time of separation, without a clear explanation such as job loss or business downturn.
Accounts or institutions that disappear from Schedule B or Form 8949 in more recent years — which may indicate accounts were closed, transferred, or moved to avoid detection.
New deductions or expense categories that appear shortly before separation, which may reflect an attempt to reduce reported income.
Consistent gaps between income and known spending across multiple years, which may point to a sustained pattern of underreporting rather than a single anomaly.

What to do if tax returns raise questions

If your review of tax returns identifies institutions, income sources, or assets that do not appear in the financial disclosure, document the specific discrepancy clearly — which form, which line, and what it appears to reference — and raise it with your attorney. From there, a request for production can ask for related records, an interrogatory can ask the other spouse to explain the discrepancy under oath, or a subpoena can be directed at the institution itself to obtain independent confirmation. See our articles on requests for production of documents and what is a subpoena in divorce. For a broader overview of these tools, see our divorce discovery guide.

Where the tax returns themselves appear unreliable — for example, where there are strong indications of underreported income — a forensic accountant can conduct income reconstruction using bank records and other evidence rather than relying on the tax return figures alone. See our article on income reconstruction in divorce.

Questions about reviewing tax returns in your divorce?
LegalZoom can connect you with a family law attorney who can advise on what to look for in financial disclosure and what discovery options are available.

Consult a family law attorney

Affiliate disclosure: We may earn a commission if you purchase through this link, at no additional cost to you. See our Affiliate Disclosure for details.

Frequently asked questions

How many years of tax returns are typically required in divorce?

Two to three years of returns is a common starting point in most divorces, though requirements vary by state and by the specific issues in dispute. Where there are concerns about a longer pattern of income concealment, returns going back further may be relevant and obtainable through discovery.

What if my spouse has not filed tax returns?

If tax returns have not been filed, that is itself relevant information. Other records — bank statements, business records, and pay documentation — can be used to estimate income through methods such as bank deposit analysis or the net worth method. A forensic accountant can assist where formal tax records are unavailable or incomplete.

Can joint tax returns be used to identify one spouse’s separate income?

A jointly filed return combines both spouses’ income, which makes it harder to isolate one spouse’s individual earnings from the return alone. However, the supporting schedules and forms — such as Schedule C for a specific business, or 1099 forms issued to one spouse individually — can often be traced back to a specific spouse even on a joint return.

What is the difference between gross income and taxable income on a tax return?

Gross income is total income before deductions; taxable income is what remains after deductions and exemptions are applied. For divorce purposes, gross income figures are generally more relevant for support calculations, since deductions taken for tax purposes do not necessarily reflect a reduction in funds actually available to the taxpayer.

Are amended tax returns relevant in a divorce?

Yes. An amended return — filed using Form 1040-X — can reveal that the originally filed return understated income or omitted information that was later corrected. If an amended return was filed around the time of the divorce, it is worth examining what changed and why, as this can sometimes reflect an attempt to correct a previous inaccuracy.

Can a forensic accountant help interpret tax returns?

Yes. A forensic accountant can review tax returns alongside bank records, business records, and other financial documents to build a complete and verified financial picture rather than relying on the return in isolation. This is particularly valuable where self-employment income, business ownership, or complex investment activity is involved. See our article on when to hire a forensic accountant in divorce.

What documents should I gather alongside tax returns?

Tax returns are most useful when reviewed alongside bank statements, 1099 and W-2 forms, business financial statements, and brokerage account statements for the same period. Our Financial Disclosure Document Checklist outlines the full range of documents to gather alongside tax returns.

Assess your financial disclosure complexity
Use the DivorceAudit Financial Disclosure Complexity Calculator to understand the complexity of your situation and receive personalised guidance on areas that may warrant attention.

This article is educational only and does not constitute legal advice. For guidance specific to your situation, please consult a qualified family law attorney in your state.

How to Read Tax Returns During Divorce