Estimated tax for LLC owners

How LLC owners estimate their taxes, quarter by quarter

By default the IRS does not tax an LLC on its income. The owners report the profit, and nothing is withheld from it, so they work out what they will owe and pay it as the year goes.

What goes into the sum When an S corp election changes it

Stage one

Income

Start from what the business keeps after expenses. Profit is the base, whether or not it was paid out.

Stage two

Self-employment

Owners who work in the business usually owe Social Security and Medicare tax on their share of the profit.

Stage three

Federal

The profit lands on the owner’s personal return, beside any other income, deductions and credits.

Stage four

State

Many states tax the same income again, and some charge the LLC a fee or tax of its own.

Line by line

What goes into the estimate

The same lines come up whichever way the sum is done, on paper or in a spreadsheet.

Business profit: Revenue less the expenses the business can deduct. Money left in the business account still counts.
Self-employment tax: Social Security and Medicare for people who work for themselves. An employer pays part of this for an employee; an owner pays all of it.
Self-employment deduction: Part of the self-employment tax comes off income before federal income tax is worked out.
Business income deduction: Many owners can also deduct part of their business income, subject to limits that depend on income and the kind of business.
Household income: A spouse’s wages on a joint return and investment income change which brackets the business profit falls into.
Credits and withholding: Tax credits and anything already withheld, from a second job for example, come off the total.
State income tax: A separate sum with its own rules. Owners in a state with no income tax may still face a franchise tax or annual fee on the LLC.

How the LLC is taxed

The set-up decides where the profit gets reported

An LLC is a state-law entity. For federal tax it takes one of several treatments, depending on its owners and any election it has made.

One owner

By default the LLC is ignored for income tax and its profit goes on the owner’s personal return.
Several owners

By default it is a partnership. It files an information return and each member reports their own share.
An election

An LLC can choose to be taxed as a corporation or as an S corporation instead, which changes the sum.

Quarterly payments

Why the tax is paid in installments

Federal tax is collected during the year, not at the end of it. With no employer withholding from the profit, the owner sends the money in.

Who pays them

Owners who expect to owe more than withholding and credits will cover, above a threshold the IRS sets.

How the amount is set

Most owners project the year’s income and tax, then split the total across the four installments.

When income is uneven

A seasonal business need not pay evenly. The annualized income method bases each installment on what was earned so far.

Avoiding the penalty

Underpayment can bring a penalty. The IRS safe harbors measure what was paid against this year’s tax or last year’s.

Revising the estimate

An estimate is only a projection. When income changes, later installments can rise or fall to catch up.

State installments

States with an income tax usually run estimated payments of their own, on their own schedule and forms.

The S corp election

When an S corp election changes the sum

The election does not change how much the business earns. It changes which part of the profit carries Social Security and Medicare tax.

Taxed by default

Self-employment tax: Generally applies to a working owner’s whole share of the profit.
Getting paid: Owners take draws. The tax follows the profit, not the draw.
Paying during the year: Estimated payments cover income tax and self-employment tax together.

Taxed as an S corporation

Social Security and Medicare: Apply to wages, not to the remaining profit that passes through.
Getting paid: A working owner goes on payroll at a reasonable salary. Remaining profit can be paid out as distributions.
Paying during the year: Withholding from the salary covers part of the tax. Estimated payments cover what is left.

The election adds payroll, a separate business return and closer bookkeeping. It lowers the total only when the tax saved is more than those costs, and the IRS can challenge a salary set too low.