Tax returns vs profit and loss: why they differ and which to trust
Short answer
A seller's P&L and tax return often show different revenue and profit. Legitimate reasons include cash vs accrual accounting, tax-only depreciation, year-end adjustments the accountant made after the P&L was printed, and personal items. Illegitimate reasons include a P&L prepared to look good for a sale.
Reconcile them line by line. When they disagree, lenders rely on the tax return, verified against IRS transcripts, and so should you until the difference is explained.
Brokers usually lead with the P&L because it's the more flattering document. Lenders lead with the tax return because it's the more reliable one. As a buyer you need both, and you need to understand every difference between them.
Legitimate reasons they differ
| Reason | Effect | How to confirm |
|---|---|---|
| Cash vs accrual | Revenue and expenses land in different years | Receivables and payables at year-ends |
| Tax depreciation (Section 179, bonus) | Tax profit much lower in purchase years | Form 4562 vs book depreciation |
| Accountant's year-end entries | Final return differs from the internal P&L | Adjusting journal entries from the CPA |
| Non-deductible items | On the P&L, added back on the return | Schedule M-1 (for entities that file it) |
| Different periods | Fiscal vs calendar year, or TTM vs annual | Match the periods first |
Reasons that should worry you
- The P&L was prepared after the decision to sell, and shows higher revenue than any filed return.
- The seller says the return understates income because cash wasn't reported.
- Amended returns filed just before the sale, increasing income.
- No accountant involved; the seller prepares both.
How to reconcile
- Line up the same periods (calendar vs fiscal year).
- Compare revenue first. Revenue differences matter most because they flow through everything.
- Ask the seller's accountant for the year-end adjusting entries and, for entities, Schedule M-1 or M-3.
- Rebuild SDE from the tax return, then explain each difference from the P&L version.
- Check the returns against IRS transcripts, as your lender will.
Then test revenue against the bank, because neither document proves cash arrived. See proof of cash.
Worked example: reconciling the return to the P&L
Illustrative example, not a real business
The internal P&L shows net profit of $212,000. The tax return (Form 1120-S) shows ordinary business income of $151,000. Line by line: depreciation on the return is $41,000 higher than in the books, because the return uses accelerated tax depreciation (a timing difference, legitimate). The P&L excludes $12,000 of officer life insurance and meals that the return also didn't deduct (no difference). The P&L shows $20,000 of revenue the return doesn't: the seller explains it's December invoices collected in January, booked on accrual in the P&L but cash basis on the return. That accounts for $61,000 of the $61,000 gap. The reconciliation holds, so you can trust the return as the base for SDE, with depreciation added back. If $20,000 of the gap had no explanation, you'd use the return, and ask why.
IRS tax transcripts when buying a business
An IRS tax transcript is a summary of a filed return taken from the IRS's own records. When you buy a business, lenders commonly ask the seller to sign Form 4506-C so they can get transcripts for the business's returns and confirm that the returns the seller handed over are the ones actually filed. A mismatch, or a missing filing, is a serious warning sign: it means the numbers you're relying on may not be what the IRS received.
A seller can hand you any document labeled "tax return." A transcript comes from the IRS. That's the whole point.
When transcripts matter most
- When the earnings in the listing depend on the returns.
- When returns were provided as PDFs with no e-file confirmation.
- When the seller recently amended returns.
- When the most recent year hasn't been filed yet.
What a transcript shows and doesn't
A transcript summarizes key lines of the filed return. It doesn't prove the return was accurate, only that it was filed as shown. You still need proof of cash and a review of add-backs.
In the LOI
List tax returns and signed transcript authorization as early diligence items, so there's no surprise later. See the LOI guide.
The seller won't show tax returns: what it means and what to do
If a seller won't show business tax returns, first ask why, and offer the usual protections (NDA, sharing only after an LOI). Some sellers are just cautious early on. But if they still refuse after a signed LOI, treat it as a serious warning: lenders generally rely on filed returns and verify them with the IRS, so a business whose returns can't be shown usually can't be financed on the earnings the seller claims. Often it means the returns show far less income than the listing.
Tax returns are the one set of numbers the seller filed under penalty of perjury. That's why lenders rely on them, and why a refusal tells you something.
Legitimate vs evasive reasons
| What the seller says | What to do |
|---|---|
| "Not until we have an NDA and LOI" | Reasonable. Sign the NDA; make returns a first diligence item. |
| "My accountant hasn't finished this year's" | Ask for prior years and a draft or year-to-date P&L. |
| "The returns don't reflect the real business" | Usually means unreported income. Price on what's filed. |
| "You don't need them, look at the P&L" | You do need them; so will the lender. |
| Repeated delays with no reason | Set a deadline; be ready to walk. |
How lenders verify
Lenders commonly have the taxpayer sign IRS Form 4506-C so they can obtain transcripts directly from the IRS and compare them with the returns provided.
What you can do
- Put tax returns and transcript authorization in the LOI's diligence list.
- Request three years of returns for the business entity.
- Compare returns with the P&L line by line.
- Value the business only on income you can verify.
Which lines to compare on each return
| Entity | Return | Where revenue is | Also check |
|---|---|---|---|
| Sole proprietor or single-member LLC | Form 1040, Schedule C | Gross receipts, line 1 | Cost of goods sold, car and truck expenses, home office |
| S corporation | Form 1120-S | Gross receipts, line 1a | Officer compensation, Schedule K-1 distributions, Schedule M-1 |
| Partnership or multi-member LLC | Form 1065 | Gross receipts, line 1a | Guaranteed payments to partners, Schedule K-1s, Schedule M-1 |
| C corporation | Form 1120 | Gross receipts, line 1a | Officer compensation, Schedule M-1 |
Officer compensation and guaranteed payments are where owner pay shows up, and they feed your add-back analysis. Distributions are not an expense, so they won't reduce profit on the return, but they show what the owner took out in cash.
When the return is late, amended or still being prepared
Sellers often have last year's return on extension when a deal is being negotiated. Ask for the draft return or the year-end financials the CPA is working from, and make the filed return a condition before closing. If a return has been amended, ask why and get both versions. If the business is behind on filing, that is a compliance problem and may mean penalties and interest. An SBA lender will verify tax returns against IRS transcripts, so any gap between what you have and what the IRS has will surface.
Frequently asked questions
Which is more reliable, the P&L or the tax return?
The tax return, because it was filed with the IRS under penalty of perjury and lenders verify it against transcripts. The P&L has more detail but is easier to change.
What is the difference between cash and accrual accounting?
Cash accounting records revenue when money is received and expenses when paid. Accrual records revenue when earned and expenses when incurred. The same business can show different results in a given year under each.
What if the P&L shows much higher profit than the return?
Ask for a reconciliation from the seller's accountant. If the explanation is 'we didn't report all the income', you're being asked to pay for income no lender will count.
Does the SBA use tax returns or financial statements?
Lenders use the highest level of financial reporting available (audited, reviewed, CPA compiled, then tax returns) for three years plus interim periods, and must verify tax returns against IRS transcripts.
What is Form 4506-C?
An IRS form that lets an authorized participant, such as a lender's verification service, request transcripts of a taxpayer's returns with the taxpayer's signed consent.
Who signs the transcript request?
The taxpayer, which for a business's returns means the seller's entity, signed by an authorized person.
Sources
- SBA SOP 50 10 8.1 (IRS tax transcript verification; financial reporting hierarchy)
- IRS: Get Transcript
- IRS Publication 946, How to Depreciate Property
- IRS: Form 4506-C (PDF)
Related guides
General information, not legal, tax, financial or investment advice. Rules and lender practices change; check the linked sources and talk to your attorney, CPA and lender about your deal. Examples with named numbers are illustrations, not real businesses. OKtoBuy's Deal Check does not value businesses or give price opinions.