Year-End Tax Planning: What Still Works in Q4

There is a conversation I have every April that is entirely useless to the person having it. They arrive with last year’s numbers, ask what can be done, and the honest answer is: for that year, almost nothing.

Tax filing is reporting on decisions already made. The decisions get made now.

#Start with the projection, not the tactics

Every move below depends on knowing roughly where your taxable income will land. Without that, you are guessing about which bracket you are managing and whether a deduction is worth accelerating at all.

So the first step is not a tactic. It is:

• Books current through Q3, at minimum, so the year-to-date figure is real
• A projection of Q4, including known large invoices and expenses
• Anything unusual flagged: an asset sale, an equity event, a big contract, a change in structure

This is where most year-end planning quietly fails. Owners whose books are three months behind cannot project, so they cannot choose, so they default into whatever happens. If that is you, catching up is not a detour from planning; it is the prerequisite.

#Timing: the simplest lever, and the most misunderstood

If you are on cash basis, you have real control over which year income and expenses land in.

Defer income by invoicing late in December rather than early, so payment arrives in January. Accelerate expenses by paying January’s bills in December.

The important qualifier: this is only a win if you expect this year’s rate to be higher than next year’s. If next year looks like a bigger year, you may want the opposite. Deferral is not automatically good; it is good when the rate arithmetic says so.

#Retirement plans: the deadlines that surprise people

This is the highest-value area for most profitable business owners, and it has the trap that catches the most people.

Some plans must be established before year end, even if you fund them later. Miss the establishment deadline and the option is gone for that year regardless of how much you want to contribute.

Others allow both establishment and funding after year end, up to a filing deadline.

They are not interchangeable, contribution capacity varies enormously between them, and the right one depends on your income, your entity type and whether you have employees. A solo owner with strong profit and no staff has options that a business with ten employees does not.

The action item for Q4 is simply this: if you do not already have a plan and your profit is meaningful, ask now rather than in March. The plans with the largest capacity tend to have the earliest deadlines.

#Investment moves

Tax-loss harvesting. Selling positions at a loss to offset gains. Losses offset gains, and a limited amount of net loss can offset ordinary income annually, with the rest carrying forward. Watch the wash sale rule if you intend to repurchase something substantially identical.

Gains timing. If you have flexibility over when to realize a gain, the same rate arithmetic as income timing applies.

Charitable giving. Donating appreciated securities held long enough generally beats donating cash and then selling, because you can avoid recognizing the gain while still deducting fair market value. Requires enough lead time for the transfer to settle, so late December is uncomfortably tight.

Bunching. If your itemized deductions land near the standard deduction, concentrating two years of charitable giving into one year can push you over the threshold in that year while taking the standard deduction in the other. A donor advised fund is the usual mechanism.

#Business-specific items worth checking

S-corp reasonable compensation. If you have an S-corp and payroll has not run correctly through the year, Q4 is the last chance to address it. This one has a hard December 31 boundary and gets expensive to fix afterwards.

Accountable plan reimbursements. If you have been paying business costs personally, reimburse them properly under a plan before year end rather than losing the deduction.

Bad debts. Receivables that are genuinely uncollectible should be dealt with rather than sitting on the books.

Contractor payments and W-9s. Not a deduction issue, a deadline issue: 1099s are due in January and W-9s are much easier to collect now than then.

Estimated payments. If income came in higher than planned, the Q4 estimate is your chance to close the gap before underpayment interest accrues further. Getting the estimates right matters more in a year that outperformed.

#A sequence that works

#The trap worth naming

Do not spend a dollar to save a fraction of it. A deduction reduces taxable income; it does not refund the purchase. Buying equipment you do not need in order to reduce tax leaves you with less cash and equipment you did not want.

The question is never “how do I lower this number.” It is “which things I was going to do anyway are worth doing this year rather than next.”

#The short version

Q4 is the last window where planning changes anything. Start with current books and a real projection, handle the retirement plan decision first because it has the earliest hard deadline, remember that equipment must be placed in service rather than merely bought, and leave income and expense timing until last because it is the most flexible.

And do it now rather than in the final week of December, when transfers do not settle, installers are booked, and everyone you need to speak to is on holiday.

If your books are not current enough to project the year, that is the first thing to fix, and there is still time to fix it before the decisions come due.