Book Income vs Taxable Income: Why Your Bookkeeping and Your Tax Return Can Differ

Why can an investor's books and tax return show different numbers?

Because they answer different questions. The books record what happened, deal by deal. The return applies tax rules to those records, and your CPA makes the adjustments. A difference between the two is normal, not an error.

• Depreciation, which the CPA sets at year end.
• Capitalized costs, which sit on a property record instead of in the year’s costs.
• Owner draws, which were never costs in the books.
• Timing, which moves income and costs between months and years.

Book figures are the starting point. The CPA's adjustments come after. That is why we hand the books over complete, using the year-end bookkeeping checklist.

How does depreciation make them differ?

The monthly books carry no depreciation for a rental. At year end it comes from the depreciation schedule your CPA sets, and the return uses the CPA's figure. Until then, monthly profit runs higher than the year-end number.

Property 1 of Demo Rentals LLC, 275 Demo St, Davis, CA, has a basis of $384,200. Its CPA split that into $134,470 of land and $249,730 of building. The CPA's depreciation schedule works from that split, so the books keep it on the property record.

The books hold the purchase records, the split and every improvement. The depreciation figure itself comes from the CPA's schedule. We cover the record that supports it in rental property cost basis and depreciation records.

What about a capitalized cost like a new roof?

A capitalized cost goes on the property's record instead of the month's costs. The money leaves the bank, but that month's profit does not fall by it. How the return treats it is your CPA's decision.

On May 14, 2026, Demo Rentals LLC paid Example Roofing Co $14,800 from checking to tear off and replace the roof on Property 1. The books posted it as an improvement, on the property's record, and flagged it for the CPA.

The $14,800.00 roof left checking the same month and is not in the profit above. It sits on Property 1's record.

Whether each invoice is a repair or an improvement is a judgment. We go through the records that support it in repairs vs improvements on a rental property. The CPA decides how the return treats it.

Why do owner draws not lower the profit?

A draw moves money from the business to you. It is not a cost of the business in the books, so it lowers the bank balance and leaves profit where it was.

The owner of Demo Flips LLC took $8,000 on the 1st of every month. From Jan 1 to Sep 1, 2026, that is 9 draws and $72,000. None of it is in the $102,297 the 7 sold projects made.

Owners sometimes expect the return to start from what was left after their draws. In the books, profit is worked out before any draw, because a draw is not a cost. We set out how owner money is recorded in owner contribution vs owner draw.

How does timing move income and costs between years?

A flip bought in one year and sold the next carries its costs into the year of the sale. A flip unsold at year end carries them into a later year. The basis of the books can shift bills between months.

From the sample report.

Each of these 5 was bought in late 2025, so part of its cost was paid in 2025. Its whole result lands in 2026, the year it sold, because its costs waited on its property record. On Sep 30, 2026, Projects 8, 9 and 10 held $1,231,120 of costs the same way.

Within a year, the basis of the books decides which month a bill lands in. We explain both in cash vs accrual accounting.

Who reconciles the books to the return?

Your CPA or tax preparer. They start from the books, make the tax adjustments and keep the reconciliation with the return. The bookkeeper's job is complete books, so every adjustment starts from a correct number.

A partnership's return has a schedule for exactly this: "Schedule M-1. Reconciliation of Income (Loss) per Books With Analysis of Net Income (Loss) per Return", set out in the Instructions for Form 1065. Which reconciliation schedule your entities file, and every figure on it, is your CPA's call.

The figures are to the Sep 30, 2026 close.

The books hand over numbers that are complete and tied to documents. The CPA turns them into the return. We set out who does which part in bookkeeper vs accountant vs tax preparer.