FOR CONSULTANTS

7 Things Nobody Tells You About Professional Tax Filing Software Until You Owe 11 States at Once

(The App Your Bookkeeper Downloaded in April Is Not the Same Product)

A first-year fractional CFO found out the difference the hard way: an 11-state tax year, a $38,000 penalty notice, and three amended returns before he finished his second year. If you bill real money across client engagements in a dozen states, the stakes are nothing like one W-2 and one state return every spring.

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Real accountants Flat monthly pricing Every on-site week mapped to a state

Phoenix · Updated September 24, 2026 · 6 min read

Advisors reviewing a laptop together at a desk

One consultant. One consumer app.

states owed in a single tax year

“I had been filing the same way since my first year independent and just assumed the penalties were normal. Amadae found four states I had been under-filing in for two years. The refund from the correction alone covered more than a year of the service.”

Fractional CFO · Third year independent

Nonresident state tax is real, and your old W-2 never warned you

Every state you work on-site in can tax the income you earned there, even if you live somewhere else entirely. A regional consultant can owe returns in 5 to 8 states in a single year. A fractional executive flying to client sites weekly can hit 12 or more. A consumer filing app that only knows your home state is missing most of them. If you spend fewer than about 15 working days a year in a given state, several states have a de minimis exception that waives the nonresident filing requirement entirely, so not every state on your calendar turns into a return. Cross that threshold and most states also give your home state a credit for tax paid to the nonresident state, so the real risk isn't double taxation, it's simply never filing the nonresident return, which means the home-state credit never gets claimed either. A single long engagement, one client site you visit every other week for six months, is usually the one that quietly crosses the line while the shorter one-off trips stay safely under it.

Do this today: Pull last year's calendar and count the states you worked on-site in. Compare it to how many state returns got filed.

State returns owed in one year

W-2 employee1

Regional consultant5 to 8

Fractional exec on the road12 or more

Client-site states that can tax the income earned there

Project bonuses get taxed like a completely different animal

Your day rate and your completion bonus are not treated the same way, and depending on the state they may not even be sourced the same way. Bonuses are frequently taxed based on your state of residency when the contract is signed, not where the work eventually happens. A consultant who signs while a legal resident of a no-income-tax state and structures the timing correctly keeps meaningfully more. This is not a loophole, just a rule almost nobody explains before the ink dries.

Do this today: Before your next engagement letter, confirm in writing exactly where you will be a legal resident on the signing date.

Modern office — A day rate is sourced state by state. A completion bonus is often sourced to where you live on signing day. Two different rules, one contract.

Your bookkeeper is not a CPA

Bookkeepers are excellent at keeping your invoices and bills straight, but most are not licensed tax professionals and fewer still specialize in multi-state consultant taxation, which is exactly where five-figure mistakes live. My bookkeeper files my taxes has cost more consultants more money than any bad engagement ever will.

Do this today: Ask whoever files your taxes how many other multi-state consultants are on their client list right now. Fewer than five is your answer.

$38,000

penalty notice one second-year fractional CFO received fourteen months after a consumer app missed 9 client states.

Amadae review of one consultant's first return

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04AMADAE

Software built for a practice that spans 12 jurisdictions a year

Generalist tools are built for one person, one state, one W-2. Amadae is tax software and service built for the opposite: it tracks every on-site week against the state where it happened, flags every nonresident filing before it is due, and keeps quarterly estimates aligned with a project calendar that changes every few months. The consultant from card one was moved onto exactly this after his amended returns. He has not missed a state since.

See My States

Built for one W-2 versus built for your calendar

	Consumer app	Bookkeeper
Maps every on-site week to a state filing
Nonresident returns flagged before they are due	Home state only	If they know
Bonus sourcing planned before you sign
Quarterly estimates for a changing calendar		Extra fee
Entity and Solo 401(k) setup around retainer income
Real accountants, flat monthly price		Hourly

The gap between engagements is actually your tax season

The bench weeks between projects feel like the reward, and they are. But they are also the window when quarterly estimates, entity decisions, and residency planning either get handled or get ignored until they become a problem at filing time. Consultants who wait until January are always playing defense. The ones who plan between engagements start the next contract with a clean picture instead of a stack of notices.

Do this today: Block two hours this month, before the next engagement starts, to check current-year income against your state deadlines and confirm your next quarterly payment is calculated, not guessed.

Before the next engagement

States worked last year counted against returns filed
Residency on signing date confirmed in writing
January 15 estimate calculated, not guessed
Preparer has 5 or more multi-state consultants as clients
Waiting until January to open the notices

Peak billing years have an expiration date. Your tax strategy needs one too.

Premium day rates last as long as demand does, and consulting demand is cyclical. A strategy built on the assumption that this income continues forever fails almost everyone. Retirement structures matter earlier than they would with a 40-year runway. A Solo 401(k) set up correctly around your entity and retainer income shelters real money in your peak years instead of leaving it fully taxed now with nothing saved for later.

Do this today: Ask your advisor to show you, in writing, how much of this year's income is protected in a retirement structure. If it is zero, that is the next call.

Woman at a desk with paperwork flying around her — Peak rates measured in years, not decades. If $0 of this year's income sits in a retirement structure, that is the next call to make.

BONUSAMADAE

Bonus: The intake that closes before the January 15 deadline

Amadae is taking consultants who sign on before the January 15 quarterly deadline at the current rate: full setup of your multi-state filing system, entity review, and quarterly estimate calendar. No long-term contract, and if it is not a fit after your first quarter you walk with a state-by-state filing map you can hand to anyone. January 15 is the last clean checkpoint before filing season gets chaotic. Spots are limited because onboarding a full multi-state history is real work on our side.

Map My States

Fractional CFO

Third year independent

Four under-filed states corrected, refund covered a year of service

One consultant. One consumer app.

states owed in a single tax year

client states the app missed entirely

$38,000

penalty notice, fourteen months later

amended returns before his second year ended

One consultant's first two years, with permission. Your numbers will differ.

Accounting built for a multi-state practice

Books, payroll, and taxes from real accountants who map your calendar, for one flat monthly price starting at $249.

Every on-site week tracked against the state where it happened
Nonresident filings and quarterly estimates calendared before they are due
Bonus and residency planning before you sign
Entity, Solo 401(k), and year-end returns handled in one place

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No long-term contract. Cancel any time. The intro call is free.

Plans from

$249/mo

If you make $40K - $69K. Flat, no hourly bills.

Monthly profit and loss reports
Tax set-aside management
Expense categorization
Real-time financial dashboard
Business bank account connections
Individual tax return included*

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Flat monthly pricingReal accountantsTaxes filed for you

Straight answers

Questions creators ask us

My bookkeeper already handles this.+

Keeping the books straight and filing 12 state returns correctly are different jobs. Ask how many other multi-state consultants they file for. A few neighboring states also have reciprocity agreements that waive nonresident filing entirely for certain cross-border work, and knowing which states have one is exactly the kind of state-by-state detail a bookkeeper's software was never built to track. If it is fewer than five, keep them for the books and get a specialist for the returns.

I already owe penalties from past years. Can that be fixed?+

Often, yes. Amended returns in the states you under-filed can turn penalties into refunds, which is exactly what happened to the fractional CFO above. Many states also offer voluntary disclosure agreements that shorten the look-back period in exchange for you coming forward first, which is worth exploring before a state finds you instead. The intro call starts with last year's calendar.

Is this only for consultants on big retainers?+

No. Nonresident filing obligations start with the first dollar you earn on-site in a state, whether you bill $500 a day or $5,000. Some states apply their own minimum filing threshold regardless of how small the engagement was. The dollar amounts scale; the filing obligations do not.

Sources

IRS: Estimated Taxes · IRS
IRS Form 1040-ES, Estimated Tax for Individuals · IRS
IRS: Deducting Business Expenses · IRS
IRS Tax Withholding Estimator · IRS

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