Tax Services in Denver, CO:
Stop Overpaying Colorado's Flat 4.4%

Colorado's 4.4% flat income tax is one of the simplest in the country to calculate — and one of the easiest to overpay. The simplicity hides the real game, which isn't computing the tax but planning around it: the federal SALT cap that quietly makes your state tax non-deductible, the PTE election that gets that deduction back, the entity choice that decides your self-employment tax, and the depreciation timing that shifts real dollars between years. For a Denver business, tax is where good planning turns straight into cash.

This guide walks the planning moves that matter most for a Colorado business — the SALT cap and the PTE workaround, entity structure, depreciation, and the industry nuances the Front Range throws at you — and how we handle it proactively and remotely, not just once a year at filing.

By Carrie Anderson — Co-Founder, 406 Consulting Group. Commercial banking and advisory background; she helps Colorado owners structure entities, time decisions, and use the PTE election to keep the combined federal-and-state tax bill as low as the law allows.

Most owners meet their accountant once a year, hand over a shoebox, and find out what they owe. That's compliance — necessary, but it's the part where the decisions are already made and the money is already spent. Real tax savings happen before the year closes: choosing the right entity, electing PTE on time, timing an equipment purchase, setting owner compensation. By April, those doors are shut. A Denver business that treats tax as a year-round planning function keeps money that a once-a-year filer simply hands over.

And the first structural decision starts with a federal rule that quietly costs Colorado owners real money.

Colorado's income tax is a flat 4.4% — no brackets, no games, easy to calculate. The catch isn't the state rate; it's what the federal government lets you do with it. Since 2018, the federal SALT deduction (state and local taxes) has been capped at $10,000per return. For a profitable Colorado business owner, state income tax alone can blow past that cap, which means the state tax you pay is no longer deductible on your federal return — you're effectively taxed on money you already paid in tax.

That sounds like a problem you just have to accept. It isn't — Colorado built a legal way around it, and most owners still aren't using it.

Colorado enacted a pass-through entity (PTE) tax election — the SALT Parity Act — that lets S-corps and partnerships pay the state income tax at the entity levelinstead of on the owners' personal returns. Because the entity pays it, the tax becomes a fully deductible business expense on the federal return, sidestepping the $10,000 personal SALT cap entirely. The owners then get a credit for the tax the entity paid. It's a legitimate, state-sanctioned move — and for a profitable pass-through, it's often the single most valuable tax decision available.

The election has timing and mechanics that have to be handled right, so confirm your situation with a tax pro and the Colorado Department of Revenue. Whether PTE even applies to you starts with a more basic question: your entity.

Your entity structure quietly sets the ceiling on your tax planning. A default LLC taxed as a sole proprietorship or partnership pays self-employment tax (about 15.3%) on all of its profit. Elect S-corptreatment and you split profit into a reasonable salary (which pays payroll tax) and distributions (which don't) — often saving real money once profit consistently clears roughly the $80,000–$100,000 range. The S-corp is also the structure that unlocks the PTE election. It's not one-size-fits-all — the savings have to beat the added payroll and compliance cost — but for a profitable Denver business it's one of the highest-return questions to get right.

Run the S-corp math for your own numbers with our S-Corp calculator. With the structure set, the next lever is how you time what you buy.

When you buy equipment — a truck, a machine, a fit-out — Section 179 and bonus depreciationcan let you deduct a large share of the cost in the year you place it in service instead of spreading it over years. That's a powerful tool for a growing Denver business, but it's a timing decision, not a reflex: a big deduction is worth more in a high-income year than a low one, and pulling it all forward can leave you with fewer deductions later. Colorado generally follows the federal treatment on the §179 side, so the planning is mostly about matching the deduction to the year you need it most.

Equipment timing shifts dollars between years. The next area shifts dollars between jurisdictions — the sales-tax side.

Colorado's home-rule sales tax is usually filed under "bookkeeping," but it's a planning question too. Where you're registered, which self-collecting cities you owe, and how you handle use taxon out-of-state and online purchases all affect your real cost and your audit exposure. Growing businesses that start selling or delivering into new Colorado cities can quietly create filing obligations they never registered for. Planning ahead — knowing where a new market creates a new return before you're in it — keeps sales tax predictable instead of a surprise assessment later.

The mechanics of setting all that up live in our Denver bookkeeping guide; the planning is knowing your footprint before it costs you. Some industries carry tax nuances all their own.

Denver's signature industries each bend the tax picture. Construction deals with use tax on materials and equipment-heavy depreciation. Energy and oil & gas carry depletion, equipment, and multi-entity structures. Technology faces R&D questions and multi-state income and sales-tax exposure as it sells across state lines. And cannabis — a real Denver industry — lives under federal IRC 280E, which disallows normal business deductions for a federally illegal substance, making entity structure and cost-of-goods accounting unusually high-stakes.

Knowing your industry's quirks is half of good planning; the other half is simply staying ahead of the calendar.

Business owners generally owe tax as they earn it, through quarterly estimated paymentsto both the IRS and Colorado. Miss or underpay them and you get penalties on top of the tax. Good planning keeps a running estimate of the year's liability so the quarterly payments are right — never a nasty April surprise, and never lending the government more than you owe. Timing income and deductions around year-end, coordinating PTE payments, and setting aside for the bill are all part of keeping cash and taxes under control rather than in a scramble.

Handling all of this well takes a partner who's in the numbers all year — which raises the question of whether that partner has to be down the street.

Tax planning is the last place a downtown address matters and the first place expertise does. What a Denver business needs is a partner who knows the SALT cap and PTE election cold, understands your entity and your industry, and is proactive all year — not one who happens to be nearby. A generalist who doesn't know the PTE mechanics is where the overpayment comes from. Modern tax work runs on secure document exchange, screen-shares, and regular planning calls, so a great remote partner who lives in Colorado's rules serves you better than a local generalist.

We work with Denver and Front Range businesses entirely remotely, and our commercial-banking background means we plan your taxes with an eye on the whole financial picture — cash, lending, and growth, not just the return.

Good tax planning starts with a review: your entity, whether the PTE election makes sense, how owner compensation is set, your depreciation position, and your estimated payments. From there it becomes a year-round rhythm — planning conversations before decisions, not explanations after them.

As you grow, the tax strategy connects to the bigger financial picture — the controller and CFO work in our Denver CFO guide.

FAQ: Denver Tax Planning