Net Worth Method vs Bank Deposits Method: How the IRS Proves Income

When a taxpayer has no reliable books, the IRS does not give up on the income figure. It reconstructs income indirectly, and the two methods examiners reach for most are the net worth method and the bank deposits method. They answer different questions. One asks how much your wealth grew; the other asks how much money moved through your accounts. Knowing which one you are facing, and why the examiner chose it, is the first step in answering it.

The short answer

The net worth method proves income by measuring the change in a taxpayer assets minus liabilities over a year, then adding personal living expenses and subtracting nontaxable receipts. The bank deposits method proves income by totaling every deposit into every account, then subtracting transfers, redeposits, and nontaxable credits. The net worth method fits taxpayers who spend or invest their income; the bank deposits method fits businesses whose receipts pass through a bank. Both are described in the Internal Revenue Manual at IRM 4.10.4, and examiners often run both and reconcile the results.

How the net worth method works

The net worth method rests on a simple idea: if what you own grew, and you also paid to live, that money had to come from somewhere. If it did not come from a documented nontaxable source, it is treated as income. The formula reads:

The hard part is not the arithmetic. It is building a defensible balance sheet at each year-end, valuing every asset the same way each year, and pinning down a living-expense figure that traces to real spending. The single most contested number is the base year: the opening net worth. Understate the assets a taxpayer already held at the start, and every later year of income is overstated. This is why the method is a courtroom staple in criminal tax cases and why defense work lives in the base-year balance. If you are rebuilding one of these, the net worth method schedule starts from year-end account balances pulled straight off the statements.

How the bank deposits method works

The bank deposits method comes at income from cash flow rather than wealth. The examiner totals every credit into every account the taxpayer controls, then strips out the credits that are not income: transfers between the taxpayer own accounts, redeposited bounced checks, and nontaxable receipts like loans and gifts. In a cash business, the agent adds back business expenses paid in cash that never reached a bank. What remains is compared to the gross receipts on the return.

Here the contested work is classification. A transfer from savings looks identical to a customer payment until you match it to a withdrawal in another account. A merchant settlement arrives net of processing fees, so comparing it to gross sales creates a variance that is not real. The full walkthrough lives on the bank deposit analysis page.

When the IRS picks one over the other

The choice is driven by where the income went and how the records fail.

In practice the two overlap. An examiner building a net worth case still uses the bank statements to prove year-end balances and living expenses, and an examiner building a deposits case still looks at asset purchases to catch income that never got deposited. That is why a taxpayer answering one method usually has to be ready to answer the other.

What both methods have in common

Whichever method you face, the underlying evidence is the same: years of bank, brokerage, and loan statements turned into structured, footed data. Both methods live or die on completeness. A missing month breaks a deposit total and leaves a year-end balance unprovable. Both require you to separate nontaxable money, whether that is a transfer, a loan draw, a gift, or an inheritance, and to document the source. And both are rebuttable. The examiner figure is a starting position, not a verdict; the answer is built line by line from the same statements the government used.

How to rebuild either method

The workflow is identical up to the last step. Convert every statement for every account across the whole period into Excel or CSV, keeping the running balance so each month foots and each year-end ties out. Tag every deposit by source and every debit by purpose. Then either total the deposits and subtract the nontaxable credits, or build a balance sheet at each year-end and add living expenses. The tagging is the same work; only the final schedule differs. Keeping the reconciled figures in one place also makes it straightforward to turn them into clean financial statements for the file or the client without rekeying anything.

The takeaway

The net worth method and the bank deposits method are two lenses on the same question: did reported income match reality? One measures wealth, the other measures cash flow, and the IRS reaches for whichever the taxpayer records make provable. Answering either one is not about disputing the arithmetic. It is about rebuilding the schedule from clean statement data, finding the base-year error or the misclassified deposit, and documenting every nontaxable dollar. Start by converting the statements to structured rows, and the rest is spreadsheet work you control.