Locum Ledger | Jan 15 Quarterly Taxes, Year-End Financial Moves & More (Nov 2026)

By Locumpedia Editorial

2026-11-06

Locum Ledger is Locumpedia’s monthly column on the money side of locum tenens work: taxes, entity choice, retirement, insurance, and per diem. It’s built with credentialed experts and anchored to primary sources, with commercial relationships disclosed. We explain the rules rather than giving advice.

With the October filing deadline behind you, the 1099 calendar quiets down to two things that still matter before spring. One is a payment. The other is a set of year-end moves that are easy to misread because some deadlines may arrive earlier than you think.

The January 15 Estimate

The fourth-quarter 2026 estimated payment is due January 15, 2027. It lands on a Friday, so there’s no weekend or holiday shift to lean on this year.

A locum who expects to owe $1,000 or more after withholding and credits is generally in the estimated-tax system. The IRS frames the penalty protection as a safe harbor: you typically avoid an underpayment penalty if you pay at least 90% of the current-year tax or 100% of the prior-year tax, whichever is smaller. The prior-year test rises to 110% for higher earners, meaning prior-year AGI above $150,000 ($75,000 if married filing separately). The payment itself goes in on Form 1040-ES. Because a 1099 income stream has no withholding doing this quietly in the background, the January payment is the one that catches people who had a strong fourth quarter.

What Has a December 31 Deadline & What Doesn’t

The year-end retirement deadline a lot of providers believe in is softer than it sounds, and knowing which pieces actually expire on December 31 is the whole planning exercise this month.

A sole proprietor with no employees can adopt a solo 401(k) after the tax year ends, as long as the plan is adopted by the return’s filing deadline without extensions, and that newly established plan can still accept an employer contribution for the prior year. A SEP-IRA can be set up as late as the due date of the return including extensions, and funded on that same schedule. An HSA takes contributions for the year all the way through the April filing deadline. None of those three has to exist by New Year’s Eve.

What does fall on December 31 is narrower. For a solo 401(k) that already exists, the IRS says the elective deferral must be elected by year-end, while the owner’s deposit itself can follow by the filing deadline, including extensions. The election is the piece with the hard date. First-year deferral rules for a brand-new plan run on a different clock from the employer contribution, so they’re worth reading in the IRS source rather than from a side-by-side chart.

Next Year’s IRS Numbers

As of November 5, 2026, the IRS had not published the 2027 contribution limits, and its official limits table still stops at 2026. The agency usually releases next year’s retirement figures in the fall; the 2026 numbers came out in mid-November 2025. Until the 2027 figures post at an IRS URL, treat any version circulating now as an estimate, not a planning number.

The confirmed figures to work against are the 2026 limits: a $24,500 elective deferral, an $8,000 catch-up starting at age 50, a larger $11,250 catch-up at ages 60 through 63, a $7,500 IRA limit, and a $72,000 SEP and defined-contribution cap. Those still have runway for anyone funding an employer contribution into the spring.

One figure that stays split through year-end is mileage. The 2026 business rate is 72.5 cents a mile for January through June and 76 cents from July 1, so a full-year mileage total has to be calculated in two halves rather than at a single rate.

The 1099-NEC Season Ahead

Locum tenens staffing firms and other businesses that pay independent contractors must furnish and file Form 1099-NEC for reportable payments by January 31. That date falls on a Sunday in 2027, so it moves to the next business day, February 1, 2027. A locum who worked with several agencies may receive a separate form from each one early in the new year.

Reconciling income is easier when the records are already organized, making a slow December a good time to catch up on bookkeeping rather than waiting until April. Income that doesn’t match the forms and deductions with no backup are both easier to fix now than under a filing deadline.

What Independent Locum Physicians & APPs Are Weighing This Month

The Planning View

Physician on FIRE runs a guest piece on tax planning for locums that calls the solo 401(k) usually the single biggest opportunity that opens up on a 1099 and walks through the self-employment-tax components and the estimated-tax safe harbor. The author’s wealth firm sells planning services, which is worth holding in mind as you read it.

Next Year’s Numbers

The White Coat Investor calculates what the 2027 limits should be from inflation data, ahead of the IRS announcement it expects in October or November. It’s a useful read on how little the limits tend to move year to year. Until the IRS publishes, figures like these are estimates, which is why this edition doesn’t repeat them.

Beyond Filing

Locum Independence, a Locumpedia content contributor, argues on its blog that proactive tax strategy is the part most 1099 physicians skip, framing an accurate return as the floor rather than the finish line. It’s a financial practice writing about the planning work it sells, which the disclosure makes plain.

Getting Set Up

The Doctor’s CPA, also a disclosed contributor, lays out a 30-day setup guide for a clinician moving from a W-2 job to 1099 locum work: separate accounts, bookkeeping, quarterly estimates, insurance, and retirement accounts. That groundwork is what makes the January 1099 season and the quarterly estimate manageable. Like the other contributors, it has a commercial interest in the services it describes.

Locum Ledger reports on the tax rules that affect independent physicians and APPs. It describes the rules; it doesn’t tell you what to do with them. This edition draws on independent publishers and on The Doctor’s CPA and Locum Independence, Locumpedia content contributors whose commercial relationships are disclosed. Locumpedia is independent and free. No source pays for placement.