The Founder's Tax Masterclass: Entities, Deductions, Retirement, and QSBS, Explained

This article is based on a Gelt founder tax masterclass led by Tal, Gelt's founder and CEO. It is general education, not tax advice. Tax rules change and every situation is different, so talk to your own advisor before acting. Figures reflect the 2026 tax year.

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Most founders we work with have already figured out the hard part. They know how to build something people pay for. What tends to go unmanaged is the tax side, and for a profitable business that is often the single largest line item of the year. Good tax planning for business owners is what turns that line item from an April surprise into a decision you make on purpose.

Gelt recently ran a tax masterclass for founders, led by our founder and CEO, Tal. It moved from the basics of how tax services fit together all the way through the strategies that save high earners real money: entity selection, the deductions founders miss, retirement planning, what happens to early losses, and QSBS. This is the written recap, organized so you can skim to the part you need. The theme underneath all of it is simple, and worth saying up front: tax planning happens during the year, not after it ends, and it is done legally. After the year closes, most of the good options are already gone.

First, the four services you actually need

Confusion often starts here, so it helps to separate four different jobs that one provider rarely does all well.

Bookkeeping is the foundation: it organizes your records into clean financial statements (a P&L and a balance sheet). We recommend it from day one. Spreadsheets almost never hold up, and even people who know taxes outsource it, because the cost of a mistake beats the cost of the service. A large 'uncategorized expense' line is a tell worth pushing back on.

Sales tax depends on your state and locality, each with its own rules. Once you cross roughly $20,000 in sales, have a conversation with a provider. States are aggressive here, and it comes up hard in due diligence if you ever sell.

Income tax is what Gelt specializes in: what federal, state, and local authorities charge on your taxable profit. No profit usually means no income tax, and real profit is where the planning below pays off.

CFO and controller services sit on top: oversight of the whole finance function, from managing the other providers to forecasting. Founders reach for this when they feel lost in their numbers, or when finance is eating time they would rather spend growing.

Entity selection: two decisions, not one

This is the section worth slowing down for, because one idea clears up most of the confusion around LLCs, S corps, and C corps.

There are two separate questions. The legal entity is how your business is registered with the state. It governs liability protection and the filings you owe. The tax treatment is how the IRS and state authorities tax that business. They are not the same thing, and one entity can carry different tax treatments.

An LLC is the most flexible option. A single-member LLC is a disregarded entity by default, so its activity flows onto your personal return on a Schedule C, with no separate business return. From there you can elect to be taxed as a partnership, an S corp, or even a C corp.

A corporation is a C corporation by default. A C corp is its own taxpayer, so profits are taxed at the entity level, currently at a flat 21% federally, plus any state tax. Founders usually land here when they take on investors, who typically require it, and who usually want the company set up in Delaware for legal reasons, not tax ones.

An S corporation is a pass-through. Profits flow to the owners, reported to each owner on a Schedule K-1, and are taxed on their individual returns. This is one of the most favorable treatments for bootstrapped, profitable founders, and it becomes especially relevant once profit (not revenue) clears roughly $100,000 to $120,000 a year. The reason founders elect it is to reduce Social Security and Medicare taxes, and depending on your profit that can be worth anywhere from about $7,000 to $30,000 or $40,000 a year.

The short version: S corp for bootstrapped and highly profitable with no investors, C corp when investors are in the picture.

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Your P&L decides your tax bill

A distinction that trips up a lot of owners: money leaving your business is not automatically a deduction. Your tax bill follows your profit, and not everything you spend lands on your P&L the way you would expect.

Assets versus expenses. A $4,000 couch is not necessarily a $4,000 deduction this year. Because it is used over time, the IRS treats it as an asset and depreciates it, unless a provision lets you accelerate that. An expense is something you use up and deduct the same year; an asset usually is not.

Inventory. By default, inventory is deductible when you sell it, not when you buy it. Buy $100,000 and sell $90,000, and $90,000 is your deductible cost for the year. The exception: businesses averaging under $32 million in gross receipts over the prior three years (most owners here) may deduct more up front. Work it out with your bookkeeper.

Draws versus payroll. Payroll (a W-2 wage) is deductible on the P&L. Owner draws and distributions are not; they reduce your equity and basis, or count as dividends. Pulling cash out as a draw is not the same tax event as paying yourself a wage.

All of this assumes you know your real profit, which is one more reason clean financial statements are not optional.

The deductions profitable founders miss

If you run your business from home or use personal property for it, several deductions are probably available. The catch is that most of these are for profitable businesses.

Home office. This covers the part of your home used exclusively for business. There are a few ways to calculate it, but the concept is the same: take that dedicated area and value it against your mortgage interest or rent. If you are losing money as a single-member LLC, you often cannot take it, so check with your advisor before you claim it.

Vehicle. The share of your vehicle used for business can be deductible, based on mileage and actual business use. There is also a heavy-vehicle rule: if a vehicle has a gross vehicle weight over 6,000 pounds, a special provision can let you deduct much more of its cost up front rather than depreciating it slowly.

Phone and internet. The business-use share of both can be deducted. The IRS gives little guidance on exactly how to measure the split between business and personal use, so this is another figure to set thoughtfully with your tax professional.

One important note for S corps: these mixed personal-and-business expenses need to be documented in a written accountable plan. That is an IRS requirement, not a Gelt invention, and it is what lets an S corp reimburse and deduct these costs cleanly. If you have partners, deductions like the home office get more complicated fast, because each partner's claim affects the others. There are entity structures that solve that, but it is a topic of its own.

Retirement: plan during the year, or lose it

If you are profitable, some of that profit should go toward the future, and the tax code rewards it. As Tal put it, he has never heard a spouse complain that someone saved too much for retirement.

For an owner-only business with no employees, a Solo 401(k) lets you contribute up to $72,000 in 2026 between the business and individual sides. A SEP IRA is simpler but usually less advantageous; if you have the choice, the Solo 401(k) wins the large majority of the time. Once you have employees, you move to a regular 401(k), which comes with obligations to those employees. And if profits are very high, in the mid six figures and up, cash balance or defined benefit plans can let you defer six figures a year in the right situation.

The non-negotiable part is timing. Most of these have to be established and funded on a schedule tied to the tax year. Reach the end of the year with nothing set up, and in many cases the opportunity is simply gone. That is the core principle of tax planning: you plan ahead, because after the fact is usually too late.

What happens to early losses

Bootstrapped founders often lose money in the first year or two, and a common question is whether that even goes on your return. It does. You report the loss, and if you are a pass-through such as an LLC, that loss flows to your personal return, where it can offset your other income, including a spouse's W-2.

There are limits, to prevent abuse. For 2026, you can use up to $256,000 of business losses as a single filer, or $512,000 married filing jointly, against your other income. Losses beyond that are not lost; they carry forward to future years. The catch is that carryforwards only work if they are actually tracked and reported correctly year over year. We regularly see founders who came from another provider, lost money early, and then owed far more than expected, because prior-year losses were never carried forward properly. Some of those mistakes can be fixed with an amendment, and some cannot if too much time has passed. It is worth getting right the first time.

QSBS and the 83(b) election

For founders building a high-growth, likely investor-backed company, QSBS may be the biggest benefit in the code. QSBS is Qualified Small Business Stock, under Section 1202, and the rules were expanded in 2025.

If you hold stock (not options) in a company taxed as a C corporation, and you meet the qualifications, you can exclude a large amount of gain from federal tax when you sell. Under the current rules, for stock acquired after July 4, 2025, the exclusion phases in with your holding period: 50% at three years, 75% at four years, and 100% at five years or more. The per-company cap rose to $15 million. Sell a qualifying company for $10 million after six years as a C corp owner, and there is a real chance you pay zero federal tax on that gain. Note that states differ. California, for example, does not conform to QSBS and will tax it. And stock acquired on or before that 2025 date generally follows the older rules (a $10 million cap and a straight five-year, 100% path), so your acquisition date matters.

One related move that founders miss: if you receive restricted stock, you generally want to file an 83(b) election within 30 days of the grant to lock in the current (low) value for future gain. It costs nothing, but the 30-day window is strict, and the election has to be sent to the IRS with proof it was filed. It is usually relevant right when you start the company and issue yourself stock, and only for restricted stock. If you hold options rather than restricted stock, the path is different, so confirm your situation with your tax professional or attorney.

The Gelt take: tax planning for business owners is a year-round job

If there is one thread running through all of this, it is that the best tax outcomes are decided early. The entity you choose, the accountable plan you put in place, the retirement account you open before year-end, the 83(b) you file in the first month, the losses you carry forward correctly: none of these can be fixed after the return is filed. That is why Gelt does tax planning year-round, with a tax professional leading and technology doing the heavy lifting behind them.

You do not have to master any of this yourself. You do have to make sure someone is managing it before the year closes, not scrambling in April. Pay the least you legally owe, and plan for it while you still can.

Frequently Asked Questions

Should I be an LLC, S corp, or C corp?

Legal entity and tax treatment are separate choices. An LLC is the most flexible and can be taxed several ways. An S corp usually fits bootstrapped, profitable founders and can reduce Social Security and Medicare taxes, especially once profit clears roughly $100,000 to $120,000. A C corp is the default when you take on investors. The right answer depends on your profit, your plans, and whether you are raising money.

Can I deduct my home office as a business owner?

Often yes, for the part of your home used exclusively for business, but generally only if the business is profitable. There are a few calculation methods based on your rent or mortgage interest. If you operate through an S corp, mixed expenses like this need to be documented in a written accountable plan.

What is QSBS and how much can it save me?

QSBS (Section 1202) can exclude a large amount of gain from federal tax when you sell qualifying C corporation stock. For stock acquired after July 4, 2025, the exclusion is 50% at three years, 75% at four, and 100% at five or more, capped at $15 million per company. Some states, like California, do not conform. Qualifying rules are specific, so confirm eligibility before you rely on it.

Want a tax strategy built around your business, not just a return filed in April? Talk to a Gelt tax strategist.