What Records Should a Montana Contractor Keep, and for How Long?

Montana's build season is short. Most contractors here cram nine months of paperwork into six months of actual work, then wonder what to do with all of it once winter hits. Here's a straight answer.

What records should a Montana contractor keep, and for how long?

Keep most financial records at least 3 years. That matches the general IRS rule for how far back the IRS can look at a filed return. Keep payroll records at least 5 years to stay ahead of Montana's wage claim window. Keep signed contracts and job files 8 years, because that's how long a Montana court can hear a dispute over a written contract. If you're ever unsure, 7 years covers almost everything.

That's the short version. Here's what it means job by job.

Day-to-day money records

Invoices, receipts, bank statements, credit card statements, and mileage logs fall under the IRS's general recordkeeping window. The IRS says to keep these for 3 years from the date you file, since that's the period of limitations for a refund claim or an audit on that return.

A few situations push that window out further. If you underreport income by more than 25% of what's on the return, the IRS gets 6 years. If you're claiming a loss from a bad debt or worthless securities, keep those records 7 years. And if you never file a return, or file a fraudulent one, there's no time limit at all.

None of this means you need to guess which bucket you're in. Keep everything 3 years at a minimum, and if a job or a write-off feels bigger or more complicated than usual, hang onto it longer.

Payroll and employee records

Montana state rule (ARM 24.16.6102) requires employers to keep wage and hour records for a period tied to the state's wage claim window. Under Montana law, an employee generally has 2 years to bring a wage claim, or 3 years if the violation was willful (MCA 39-3-207). Most payroll advisors recommend keeping 5 years of payroll records to stay safely ahead of that.

If you're a contractor with employees, Montana also requires you to register with the Department of Labor and Industry. That's separate from tax recordkeeping, but it's worth mentioning here because the same file where you keep your registration is a good place to keep your payroll history too.

If any of your crew works on a public works or prevailing wage job, that's its own category. Certified payroll and basic records for laborers and mechanics on those jobs need to be kept 3 years after the project wraps, under federal Davis-Bacon rules.

Job files, bids, and contracts

This is the one Montana contractors underestimate. Montana's statute of limitations on a written contract is 8 years (MCA 27-2-202). That clock usually starts at the last payment made or the date something went wrong, not the date you signed. So a job file needs to survive at least that long: the signed contract, change orders, payment records, job photos, punch lists, and lien waivers.

An 8-year window feels long when you're standing in a garage full of banker's boxes in November. It's short when a client calls two winters later asking why a change order wasn't billed. Because Montana's build season is so compressed, a lot of contractors finish 15 or 20 jobs between May and October and only sort the paperwork once things slow down. That's exactly when a folder goes missing. Scanning each job file the week you close it out, instead of boxing it for later, is the cheapest insurance you'll ever buy.

Equipment, vehicles, and permanent records

Keep records tied to a piece of equipment or a vehicle for as long as you own it, plus 3 years after you sell, trade, or scrap it. That covers questions about what you paid, what you've claimed on it, and what it was worth when it left your hands.

Some records don't have an expiration date at all. Articles of organization, your operating agreement, and anything establishing how your business is structured should be kept permanently. Don't shred those, ever.

How long to keep it: quick reference

Where to keep it

Paper survives a Montana winter about as well as you'd expect. A shared drive or a bookkeeping platform that stores documents alongside the transaction is worth more than a filing cabinet once you're a few years in. If your books are already set up with monthly bookkeeping for Bozeman contractors, most of this is already attached to the transaction and you're not hunting for a receipt from a job you finished two summers ago.

Recordkeeping ties directly into knowing whether a job actually made money. We wrote about why job profitability gets fuzzy on busy Montana construction jobs and what good job files fix. And if you're trying to figure out whether you need help with day-to-day records or something bigger, the difference between a bookkeeper and an accountant is a good place to start. Montana's lack of a state sales tax changes some of this too. We broke down what Montana's no-sales-tax rule does and doesn't change for your books.

If your records are scattered across a truck console, a shoebox, and three different apps, that's normal this time of year. Give Blackfin a call at 406-404-8955 and we'll help you set up a system that holds onto what you need, for as long as you need it, without you having to think about it every time a client calls two years after a job closed.

This post covers general recordkeeping practice, not specific tax advice for your situation. Talk to us about what applies to your business.