1031 Boot Calculator
Built for the people who have to explain boot to a client before closing — qualified intermediaries, exchange coordinators, CPAs and the advisors sitting across from the seller.
It prices the exchange, not the pitch. No state is assumed. Pick one, because rates, transfer taxes and clawback rules are not the same in Texas as they are in California, and a calculator that quietly defaults to one of them is wrong everywhere else.
What is the tax bill on your property sale going to be?
Send me the sale price and rough basis and I'll email you the actual number within one business day — plus the Seller's Guide to §453. If it doesn't fit your deal, I'll tell you that plainly.
No retainer · no obligation · the carrier compensates the broker, not you.
Whose tax is this?
Every number below is priced against these. They move the answer more than the boot does — a boot worth structuring for one seller is pointless for another.
What you're selling, and what you're buying
Boot is the part of your exchange that doesn't defer. It comes from two places — cash you don't reinvest, and debt you shed without replacing. Both are below.
How your depreciation was taken
This decides the character of the boot, which decides whether a note can help. Straight-line on the building is §1250 — taxed at 25%, and it can be spread. Anything a cost segregation study moved into 5-, 7- or 15-year property is §1245 — ordinary income, and §453(i) puts all of it in year one no matter what you do.
Your tax picture
Boot stacks on top of everything else you earn that year — that's why the same boot costs two sellers different amounts.
What you can still do about it
Every one of these has to be in place before the intermediary wires the money. After closing there is no amending your way out.
Two structures, side by side
What has to come out now, and what can ride the note
Two layers of a boot can never be spread however the deal is papered: §1245 cost-seg recapture, which §453(i) puts in the year of sale, and mortgage boot — debt the buyer took over, which is consideration you are treated as receiving with no cash behind it (Reg. §15A.453-1(b)(3)(i)). Everything below those two can ride the note.
What the boot is made of
Recapture comes off the front. Only the layers below it can ever be spread.
The phantom bill
Tax you owe versus cash you actually received.
What the fixes do
Your actual deadline
Your 45-day identification
The deduction you thought you were buying
Reg. §1.168(i)-6 — carryover basis keeps depreciating on the OLD schedule. Only new money gets a fresh clock.
Is the note's rate high enough for the IRS?
A below-market coupon is not cheap money for the buyer. §1274(c)(2) reprices the note: part of what the contract calls principal becomes interest — ordinary income, not 25% or 0/15/20% gain. This is the first thing a qualified intermediary will ask about.
Why the note gets sized at $5.0M
§453A(c) charges interest on the tax you have not paid yet — but only on the share of the note above $5,000,000. It is not a penalty and not a tax on the gain; it is rent on the deferral, billed every year the note is outstanding.
What happens if you borrow against the note
§453A(d)(1) treats the net proceeds of any borrowing secured by an installment obligation as a payment received on that obligation. The gain comes due the day the note is pledged — and unlike the interest charge above, this rule has no $5,000,000 threshold.
The two-year trap on a related buyer
§453(e)(1): if the person who bought from you is related and resells before you have been paid out, what they receive is treated as received by you. For two years your deferral is contingent on somebody else's decision.
Both sides, year by year
Paying the tax on day one permanently shrinks the principal at work. Both routes are taxed identically — the only difference is timing. The chart runs the two of them side by side; below it, each is stated as the pre-tax rate a CD would have to pay to match it.
Take it as cash, or take it as a note
Same boot, two ways to receive it.
Basis of calculation
What this was run on
Authority relied on
Run your specific numbers
The calculator runs your sale through real 2026 federal + state tax brackets and shows §453 savings vs lump sum side-by-side.
Run the calculator → 317-463-6659