Tax planning and bookkeeping for business owners in Massachusetts and across the country

Know your number before it comes due.

A projection from your real books mid-year, estimates sized to it, and a firm that calls before the deadline instead of explaining it in April.

Enrolled Agent, admitted to practice before the Internal Revenue Service. Stoneham, Massachusetts, with clients from coast to coast. Every return reviewed and signed by an Enrolled Agent.

Tax planning
creates options

Plan today for a more certain tomorrow.

  • Lower taxes
  • Greater control
  • Brighter opportunities

Tax planning The year ahead

Every date on the calendar is a decision that has to be made before it.

Most surprises in tax are not mistakes. They are dates that arrived before anyone had looked at the numbers. This is the calendar we work to, and the needle marks where you are in it today.

Talk About Your Tax Calendar

Planning turns deadlines into opportunities.

Key tax datesA more certain tomorrow

  1. Jan 15 Fourth estimated payment for the year just ended.
  2. Mar 15 S corporation and partnership returns, or their extension. Also the last day to elect S corporation status for the current year.
  3. Apr 15 Individual returns, the first estimated payment of the new year, and C corporation returns.
  4. Jun 15 Second estimated payment.
  5. Sep 15 Third estimated payment, and extended S corporation and partnership returns.
  6. Oct 15 Extended individual returns.
  7. Nov to Dec Year-end planning: the last window in which the year’s result can still be changed.

Federal dates for calendar-year filers. When a date falls on a weekend or a federal holiday it moves to the next business day. Massachusetts dates can differ, and we track both.

Tax advisory for what comes next

02 The firm

Big-firm experience, senior-led all year, for owners who want the number early.

50
states in which an Enrolled Agent is federally licensed to represent you before the IRS. That is a representation licence, not a licence to prepare every state's return, and we say which is which before any work starts.
10+
years reading business numbers. First as a bank loan analyst deciding whether to lend against them, then in public accounting, then reviewing returns at one of the country's leading CPA firms.
12
months a year on your file. Projections, estimates and entity reviews run through the year, not only in the weeks before a deadline.
  • Senior-led from the first call to the signed return.
  • Every return reviewed and signed by an Enrolled Agent.
  • Clients in Massachusetts and from coast to coast, on the same monthly rhythm.
Mike Isaac, EA Enrolled Agent and founder. Trained at one of the country's leading CPA firms. About Mike →
03 Where our clients are
A brass compass and a pair of dividers resting on an antique map of the United States
A map of the United States

The same engagement whether you are in Stoneham or three time zones away.

TaxMap Advisors is a tax planning, bookkeeping and advisory firm in Stoneham, Massachusetts. We work with small businesses, owner-operated companies and the companies they grow into, across Greater Boston and from coast to coast. Our founder spent four years reviewing other preparers' returns at one of the country's leading CPA firms. Nearly every expensive mistake he corrected had a cheaper answer months earlier. That is the practice we run: books you can decide from, a number you know before it is due, and a firm that calls first.

Documents
Move through a secure upload link, never by email.
Meetings
By video or phone, in the same business hours as local clients, Saturdays included.
Signatures
Engagement letters, authorizations and returns are signed electronically.

Where we work, town by town and state by state

Our services

Eight kinds of work, one team on the file.

Most owners start with one and grow into the rest as the numbers get cleaner. Every one of them is led by an Enrolled Agent and runs on the same monthly rhythm.

  1. Tax Preparation Accurate returns. Less stress. For owners with a business return and a personal return that have to agree, and often a second state in the mix.
  2. Tax Planning & Advisory Strategy for what's next. For owners who learn what they owe on the day it is due. A projection built mid-year, sized to your real numbers.
  3. Monthly Bookkeeping Clean books. Clear decisions. For businesses whose books are close enough to file from but not good enough to decide from.
  4. Cleanup & Catch-Up From messy to confident. For books that have not been touched in months, or years. Rebuilt from bank statements and source documents, oldest month first.
  5. Entity Strategy The right structure. Real benefits. For owners whose profit has grown past the structure they started with. LLC or S corporation, with owner pay set at a salary you could defend.
  6. Payroll & Sales Tax Stay compliant. Avoid surprises. For employers and anyone collecting Massachusetts sales or meals tax. Setup reviewed against what was actually filed.
  7. IRS & State Notices Clear guidance. Strong representation. For anyone holding an IRS or Massachusetts DOR letter, wherever you live. Diagnosed against your transcripts and handled in writing.
  8. Controller & CFO Support More insight. A stronger business. For owners deciding on hiring, pricing and borrowing. A budget, a rolling forecast and a cash runway, reviewed every month.
The clock of the Custom House Tower in Boston, lit by the last of the sun
04 The decision

Should you elect S corporation status?

Enter your real profit and a salary you could defend for the work you do. The tool shows what an S corporation election would save on federal self-employment tax, and where payroll costs start eating the saving. It will not decide for you. It narrows the question.

Profit
Owner salary
S-corp saves $12,484

Federal tax, married filing jointly. Change any of it below.

Your numbers

What you would pay yourself as W-2 wages. It has to be reasonable compensation.

Estimated federal tax

Sole proprietor -
S-corporation -

Difference -

Income tax
-
SE / payroll tax
-
QBI deduction
-
Effective rate
-

Illustrative only, and not tax advice. A simplified federal estimate on 2026 figures. It leaves out state tax, credits, payroll costs and more, and no result here creates a client relationship. What this estimate leaves out · Talk it through first

Want the reasoning rather than the arithmetic? How the S-corp saving actually works.

05 The process

How it starts.

  1. A free 30-minute conversation

    By video or phone. Tell us what is bothering you: the bill that surprised you, the books that are behind, the letter on the desk, the accountant who stopped calling back. Bring last year's return if you have it.

  2. A read of your return

    Bring last year's return and we read it together, usually right there on the call: what was missed, and whether the books it came from could have supported it. You get that read in plain language before you commit to anything.

  3. A written scope, then a monthly rhythm

    What we will do, who does what, and the fee, in writing before any work begins. Then the books close every month, the estimates move when the business moves, and the call comes before the deadline.

No obligation. You meet an Enrolled Agent. You leave knowing your next step.

06 In their words

What clients say when the year is over.

  • We thought he was just someone who files taxes, but he turned out to be a true specialist. Experienced, professional, and very knowledgeable. He explains both the small details and the big picture clearly.

    Marianne T.Google review

  • I thought I only needed bookkeeping and tax filing. What I actually needed was real strategy. The books were cleaned up, the numbers finally made sense, and the tax planning got sharper.

    Wessam A.Local Guide

  • Very knowledgeable, honest, and detail-oriented. Everything was explained clearly, questions were answered fast, and the process felt smooth instead of stressful.

    Moustafa A.Google review

4.8 out of 5 on Google Based on real client reviews

07 The questions

Decisions owners bring us, and how we think about them.

Should I elect S corporation status this year?

Only if the numbers clear two tests. First, profit has to be high enough that a reasonable salary for your work still leaves a meaningful amount to take as distributions, because self-employment tax on that slice is the entire saving. Second, the saving has to beat the cost of running payroll, filing a separate return and keeping cleaner books. Timing matters too. For a calendar-year business, an election filed by March 15 applies to this year, and a later one generally waits until next year. Run your own figures through the calculator on this page, then bring last year's return and we will test it properly.

When should I start making estimated payments?

As soon as you expect to owe $1,000 or more in federal tax after any withholding. Below that, the underpayment penalty generally does not apply. Above it, the IRS expects four payments through the year, in April, June, September and January, and charges a penalty when they fall short, even if you pay in full when you file. The safe route is to pay in a set share of last year's tax or of this year's, which is what the safe harbor rules allow. Massachusetts has its own, lower threshold. If you took distributions this year and paid nothing in, call before the next due date.

Should I clean up old books before filing?

Yes, if the books do not reconcile. The test: if the bank balance in your software does not match the statement for the same date, you are not ready to file. A return prepared on top of that is a set of guesses. A guess that overstates income costs you money now, and a guess that understates it costs you later. Cleanup first also shortens the return, because nothing gets rebuilt in filing season. If the deadline is close, file an extension, fix the record, then file. Nobody here will judge the state of the books. Send the last reconciled month and the last filed return and we will tell you how far back it goes.

Should I answer an IRS notice myself?

Not before you know what it is. Find the notice number in the corner and the response date, then resist two reflexes: paying the balance printed on the front because it is printed there, and leaving the envelope closed. Many notices are automated matching letters, not audits, and a short written reply with the right document settles them. A rushed reply can concede a point you would have won. As an Enrolled Agent, Mike Isaac is federally licensed to represent you before the IRS, so with a signed power of attorney the correspondence comes to us as well. Send a copy of the notice the day it arrives.

Should I keep the books monthly or catch up at year end?

Monthly, once you have employees, inventory, a loan, or more than a handful of transactions a week. A year-end catch-up produces books that are good enough to file from and useless for running the business, because by the time you see the margin on a job it is nine months old. The test is simple: if you cannot say what last month's profit was, the books are too far behind to decide from. Monthly closes also catch errors while they are cheap. A missing deposit found this month is a phone call. If you are behind now, start with a cleanup, then move to a monthly close and stay there.

What happens at the first meeting, and what should I bring?

The first conversation is free, thirty minutes, by video or phone. Bring last year's business and personal returns, access to or an export from your accounting software, your most recent payroll reports if you have staff, and any notice you have received. We read the return for what was missed and the books for whether the return could have been right in the first place, then tell you what we see before you commit to anything. If the fit is wrong, we say so. Book a time online or call during business hours, which include Saturdays.

How do fees work?

By the scope of the work, quoted in writing before anything starts. After the free consultation and a look at your return and books, you receive a written scope: what we will do, who does what, and the fee. What moves the fee is the number of entities and states, the condition of the books, and how much planning you want through the year. If something outside the scope comes up, we discuss it with you before we do it. The consultation itself is free, thirty minutes, with no obligation at the end of it. Fees begin only with the written scope.

Am I too small, or too large, for your firm?

The test is the decisions in front of you, not your revenue. Too small is rare. If a once-a-year return is genuinely all you need, we will say so. Too large is a question of scope, not size. Our founder prepared and reviewed returns for individuals, pass-through entities, corporations and nonprofits at one of the country's leading CPA firms, and that is the standard the work here is held to. We assess your entities, your states, the condition of the books and the deadlines before accepting an engagement. If a matter needs expertise outside our scope, we identify that early and tell you.

Do you work with clients outside Massachusetts?

Yes. Clients from coast to coast work with us on the same monthly rhythm as the owner down the street: documents through a secure upload link, meetings by video or phone, signatures electronic. An Enrolled Agent is federally licensed to represent taxpayers before the IRS wherever they live, so IRS matters and federal returns run the same way in any state. State returns are a separate question. Massachusetts is home ground. Other states we confirm case by case before we take the work, and if a state requires something we do not hold, we say so and point you to someone who does.

Should I register my home-based Massachusetts business for sales or meals tax?

It depends on what you sell, not where you sell it from. Massachusetts taxes sales of tangible goods and a short list of specific services, so if you sell products, including online to Massachusetts customers, you register with the Department of Revenue before the first sale and collect from then on. Meals tax applies to prepared food and drink, and many towns add a local option on top. Most pure services are not taxed. If you have been selling without registering, the fix is to register and file the open periods yourself before the state finds them. Bring your sales records and we will map the obligations.

The first thirty minutes are free. Use them to ask hard questions.