By Austin D., Lease Solutions
An Illinois lease buyout is taxed in full — for the typical national lessor, at the combined rate for your home address — on top of the tax you paid across your lease payments, with the credit explicitly denied. Your leasing company collects it on Form ST-556 within 20 days. Add a $165 title, $151 registration, and, in Chicagoland, city and county add-ons. The consolation: for covered consumer leases, Illinois law bans excess-wear charges when you exercise your purchase option. Or one call runs the whole thing.
The Double Tax, Illinois Edition
Since 2015, a qualifying Illinois lease is taxed on the amount due at signing plus the total of your lease payments — that tax rode quietly inside your monthlies. Then comes the buyout, and the state's ST-556 instructions close the door that matters: for vehicles taxed the post-2015 way, the seller may not claim the credit for tax already paid. Practical effect: your residual is taxed again, in full, as a fresh retail sale. Nothing on your paperwork went wrong — that is the design, and it belongs in your buyout math from day one.
The Form Half the Internet Gets Wrong
Search this topic and you'll find confident advice about RUT-50 (the private-party form) and RUT-25 (the out-of-state purchase form). Both are wrong for a lease buyout. Illinois treats your leasing company as a retailer, and the state's own instructions tell out-of-state lessors in so many words not to use RUT-25 for lease-end sales: the buyout is reported by the leasing company on Form ST-556, with the tax collected from you and the return due within 20 days of delivery. For a national leasing company with no Illinois sales location, the rate applied is the combined rate at your home address — which is where Chicagoland geography starts costing real money.
Chicagoland: Where the Rates Stack — and Just Stepped Up
- The base: Illinois' vehicle rate starts at 6.25%. Per the state's current published schedules, Cook County registrations moved to 7.5% and the collar counties (DuPage, Kane, Lake, McHenry, Will) to 7.25% on August 1, 2026; the Metro East district runs 6.5%.
- Chicago residents: the city's 1.25% home-rule use tax can apply on top of a vehicle purchase — whether your lessor collects it depends on its Illinois footprint, so budget for it either way.
- Cook County's extra 1%: the county's own use tax is billed separately by the Cook County Department of Revenue — it does not appear on the state form, and sellers outside the county may not collect it. That's why Cook County buyers sometimes get a county letter weeks later: it's not a scam, it's the 1%.
The Rule That Runs Your Way: No Wear Charges on a Buyout
Illinois' Motor Vehicle Leasing Act contains one of the most buyer-friendly sentences in any state's lease law: upon the lessee's exercise of a purchase option, the holder “may not charge, receive, or collect a charge for excess wear and damage” (815 ILCS 636/55). Buy the car and the scratched bumper and worn seats stop being billable events — not as a courtesy, but by statute, for the consumer leases the Act covers. The same Act gives a statutory early-termination right after 12 full payments with liability capped by formula, and requires your lease to disclose the residual and capitalized-cost numbers a buyout decision needs. If your car has been through some life, this section alone can decide keep-versus-return — compare it against what turn-in charges would have cost.
Title and Registration: Not Complicated, Just Expensive
Illinois paperwork is straightforward and pricey, per the Secretary of State's published fees: $165 for the certificate of title, $151 a year for passenger registration, and a 20-day statutory window to apply for your new title after delivery (the tax return runs on its own 20-day clock at the same time). If you financed the buyout, your lender is recorded as lienholder. How your existing plates carry across is squared away when you file — the Secretary of State's office confirms your registration situation on the spot.
Or: One Call From Anywhere in Illinois
The payoff quote, financing arranged through partner lenders, the ST-556 handled by the right party, both 20-day clocks, the title, and the registration — run with you by phone and online for one flat $695 fee, with tax and state charges paid at cost. Start with the buyout calculator or get your buyout options — no credit pull to see where you stand.
Illinois Lease Buyout FAQ
How much is sales tax on a lease buyout in Illinois?
The buyout is a separate retail sale, taxed in full — for the typical national leasing company with no Illinois sales location, at the combined rate for your home address. That starts at the 6.25% state base and runs higher in the Chicago area (Cook County moved to 7.5% and the collar counties to 7.25% on August 1, 2026, per the state’s published schedules). Chicago residents can also owe the city’s 1.25% home-rule use tax, and Cook County adds its own 1% — billed separately by the county, not on the state form.
Didn’t I already pay tax during my lease?
Yes — since 2015, qualifying Illinois leases are taxed on the amount due at signing plus the total of your lease payments. And the state’s own ST-556 instructions explicitly deny the credit at buyout for vehicles taxed that way — so the residual is taxed again, in full. Two bites is the design, and it belongs in your buyout math from the start.
What form does an Illinois lease buyout use — RUT-50?
No — and this is the most-repeated mistake online. RUT-50 is for private-party purchases, and RUT-25 is for out-of-state dealer purchases; the state says leasing companies must NOT use it for lease-end sales. A lease buyout is a retail sale by the leasing company, reported by the LESSOR on Form ST-556 with the tax collected from you, due within 20 days of delivery.
Can the leasing company charge me for excess wear if I buy the car?
No. Illinois law is unusually direct: upon the lessee’s exercise of a purchase option, the holder may not charge, receive, or collect a charge for excess wear and damage (815 ILCS 636/55). Buying the car doesn’t just avoid the turn-in inspection — in Illinois it legally erases the wear bill for covered consumer leases.
What does the paperwork cost in Illinois?
The big-ticket items per the Secretary of State’s published fees: $165 for the title, $151 for annual passenger registration, and a 20-day statutory window to apply for the new title after delivery. Illinois paperwork isn’t complicated so much as expensive — budget for it alongside the tax.
Does Illinois give me any early-exit rights?
For consumer leases the Motor Vehicle Leasing Act covers, yes: after 12 full periodic payments you have a statutory right to terminate early, with your liability capped by a formula in the law — and the Act requires your lease to disclose the residual and capitalized cost figures a buyout decision needs. Your lease agreement is where those numbers live.
Sources: Illinois Department of Revenue, ST-9-LSE (Leasing Companies), Form ST-556 instructions, RUT-25 instructions, and vehicle tax guidance; Illinois Secretary of State fee schedules; 625 ILCS 5/3-112, 3-806, 3-821; 815 ILCS 636 (Motor Vehicle Leasing Act); Cook County use-tax synopsis. Figures current as of August 2026; taxes and fees change — confirm current amounts with IDOR and the Secretary of State. This article is general information, not tax or legal advice.