Somewhere in the next few weeks, a benefits packet will land on your desk or in your inbox. It will be long, it will be written in a dialect of English spoken only by human resources departments, and it will contain the single highest-leverage hour of financial work available to most working households. Here is why this year's version deserves more than a skim.

According to Mercer's National Survey of Employer-Sponsored Health Plans, total health benefit cost per employee is expected to rise 6.7% in 2026, the largest increase since 2010, pushing the average cost above $18,500 per employee. That is the number after employers made changes to hold costs down; without those changes they estimated the increase would have exceeded 9%. Prescription drug benefits are among the fastest-growing components, rising about 9% this year. For perspective, the decade before this run of increases averaged roughly 3% a year.

Next year looks much the same. In Mercer's Survey on Health and Benefit Strategies for 2027, released June 11, 2026, nearly half of large employers, 48% of those with 500 or more employees, said they expect to change their medical plans in ways that raise what employees pay out of pocket, such as higher deductibles or copays. Another 31% offer or plan to offer at least one non-traditional medical plan in 2027, such as a high-performance network or a variable copay design, and a further 38% are considering one.

Translate all of that out of corporate and it means: higher deductibles, different networks, new drug tiers, a restructured premium share. The plan you had last year may not be the plan wearing its name this year. Rolling over your elections without looking is not neutral. It is an active bet that nothing changed.

The HSA Is Still the Best Deal in the Tax Code

If your employer offers a qualifying high deductible health plan, the Health Savings Account attached to it remains the only account in American tax law with three separate tax advantages: contributions go in pre-tax, growth is untaxed, and withdrawals for qualified medical expenses come out tax-free. No 401(k) does that. No IRA does that. And unlike a flexible spending account, an HSA balance is yours permanently. It does not expire in December, and it follows you when you change jobs.

The IRS published the 2027 figures in Revenue Procedure 2026-24 this past spring, which means you can plan next year's contribution with real numbers rather than guesses.

The self-only limit rises $100 from the 2026 amount of $4,400, and the family limit rises $250 from $8,750. The age-55 catch-up stays at $1,000, because Congress wrote that number into statute and never indexed it. Note that a high deductible plan is not automatically the right answer: it is the right answer when your cash flow can absorb the deductible and you intend to actually fund and invest the HSA rather than treat it as a checking account with a medical label.

The FSA, and Its Ticking Clock

A health flexible spending account is the HSA's less generous cousin: pre-tax dollars, no investment growth, and a deadline. For plan years beginning in 2026 the employee contribution limit is $3,400, and plans that permit a carryover may allow up to $680 of unused funds to roll into the following year. Both figures come from IRS Revenue Procedure 2025-32. The 2027 amounts are typically announced in October, so if your enrollment window closes before then, elect against this year's number and adjust later if your plan allows.

Two practical notes. First, carryover is permitted, not required, and your employer may cap it lower or offer a grace period instead. Read your specific plan document rather than an internet summary. Second, enrolling in a general-purpose health FSA makes you ineligible to contribute to an HSA, and that includes coverage through a spouse's FSA. A limited-purpose FSA, restricted to dental and vision, does not. Choosing your medical plan and choosing your spending account are one decision, not two.

The Five Minutes Everyone Skips

• Confirm your beneficiaries. Life insurance and retirement plan beneficiary designations override your will. An ex-spouse listed in 2014 is still listed in 2026 unless you changed it.
• Check whether your doctors are still in network. Networks are renegotiated annually and the plan name staying the same tells you nothing.
• Price the disability coverage. Group long-term disability through work is usually the cheapest income insurance you will ever be offered, and your income is the asset funding every other plan you have.
• Look at the dependent care FSA. If you pay for childcare or adult day care, this is pre-tax money you are otherwise leaving on the table.
• Read the drug formulary if you take a maintenance medication. A tier change is the most common unpleasant surprise of the plan year.

None of this is glamorous. All of it is decided in a window that opens shortly and closes quietly, usually before anyone has gotten around to it.

Medicare Open Enrollment runs from October 15 through December 7. Changes made in that window take effect January 1. During it you may join, drop, or switch a Medicare Advantage plan, join, drop, or switch a Part D drug plan, or move between Original Medicare and Medicare Advantage. Outside of it, your options narrow considerably.

This is the part worth sitting with. In KFF's most recent analysis of the Medicare Current Beneficiary Survey, covering the open enrollment period for 2022 coverage, 69% of beneficiaries did not compare their own coverage against the other options available in their area. Among people in traditional Medicare the share was 73%; among Medicare Advantage enrollees, 65%. More than four in ten Medicare Advantage enrollees, 43%, did not even review their own plan for changes to premiums, deductibles, or copays. And 82% of those in Medicare Advantage drug plans never compared their drug coverage against anything else on offer.

Those changes are not cosmetic. Every fall, plans revise premiums, deductibles, provider networks, and drug formularies. Your plan is required to send you an Annual Notice of Change describing exactly what will be different in January, and CMS requires that it reach you by September 30. It is the least exciting mail you will receive all year and the most financially specific.

The Numbers You Are Working From

Below are the current 2026 figures, released by CMS in November 2025. The 2027 premiums and deductibles are normally announced in the fall, so expect updated numbers partway through the enrollment window. Choose your plan on coverage and network fit first, then adjust for the final premiums when they land.

Source: CMS, 2026 Medicare Parts A & B Premiums and Deductibles, November 14, 2025. The 2026 standard Part B premium of $202.90 is $17.90 higher than the 2025 figure of $185.00, an increase of roughly 9.7%, and the Part B deductible rose $26 from $257.

Two Traps Worth Naming

The IRMAA lookback. Higher-income beneficiaries pay an income-related monthly adjustment amount on top of the standard Part B and Part D premiums, and it is calculated from a tax return two years old. Your 2026 surcharge is based on your 2024 return. This is why a one-time event in your sixties, such as a Roth conversion, a business sale, or a large capital gain, can raise your Medicare premiums two years later. If your income has since fallen because of a life-changing event such as retirement or the death of a spouse, you can ask Social Security to reconsider using Form SSA-44.

The drug cap is real, and it is per plan year. Since the Part D redesign, out-of-pocket spending on covered drugs is capped, at $2,100 for 2026. Premiums do not count toward it, drugs your plan does not cover do not count toward it, and Part B drugs such as many infusions are outside it entirely. It is a genuine protection with genuine edges.

While You Are Looking

Social Security's cost-of-living adjustment for 2027 is announced in October, once the September inflation reading is published. For context, the 2026 adjustment was 2.8%, which the Social Security Administration said would raise the average retirement benefit by roughly $56 per month. The COLA and your Medicare premium are deducted from the same check, so the useful number is not the raise; it is the raise minus the premium increase.

One last date. If you enroll in a Medicare Advantage plan and regret it, the Medicare Advantage Open Enrollment Period runs January 1 through March 31 and gives you one chance to switch plans or return to Original Medicare. It is a safety net, not a substitute for choosing carefully in the fall.

Buried in the SECURE 2.0 Act of 2022 was a provision that took effect on January 1, 2026, after Treasury and the IRS issued final regulations in September 2025. It works like this: if you are age 50 or older and your Social Security (FICA) wages from the employer sponsoring your plan exceeded $150,000 in the prior year, any catch-up contribution you make to a 401(k), 403(b), or governmental 457(b) must be made as Roth, using after-tax dollars. The pre-tax option is gone for you.

The $150,000 threshold is the indexed figure for 2026, raised from the $145,000 written into the original statute, per IRS Notice 2025-67. Three details matter more than the headline.

• It is a prior-year test. Your 2026 treatment depends on your 2025 wages, not on what you earn this year. A raise in July does not change your 2026 status; it changes your 2027 status.
• It is employer by employer. The test looks at wages from the employer that sponsors the plan. Changing jobs mid-year can produce results that feel arbitrary but follow the rule exactly.
• It applies to the catch-up only. Your regular elective deferral can still be pre-tax. Only the extra amount above the standard limit is affected.
• Your plan has to offer Roth. If it does not, affected participants generally cannot make catch-up contributions at all, which is why most plans added a Roth option ahead of the deadline.

Source: IRS, IR-2025-111 and Notice 2025-67, November 13, 2025. A participant aged 60 to 63 who uses the higher catch-up can defer up to $35,750 in 2026.

Is This Bad News?

Less than it sounds. You lose a deduction today, at what is presumably a high marginal rate, and in exchange the money grows and comes out tax-free in retirement, with no required minimum distributions on the Roth balance during your lifetime. For someone who expects to face meaningful taxable income in retirement, or who wants a pool of tax-free money to draw on in a year when a large withdrawal would push them into a higher bracket or trigger a Medicare surcharge, forced Roth is a genuinely useful outcome dressed up as an imposition.

The real action item is cash flow. Because the contribution is no longer reducing your taxable income, your tax bill for 2026 is slightly higher than a naive projection would suggest. If you are a high earner making full catch-up contributions and you have not looked at your withholding since January, that is a ten-minute task with a real payoff. The IRS Tax Withholding Estimator is free.

The Rest of the Year-End List

August is early enough that every item below is still comfortably fixable, which is precisely why we are raising them now instead of in December.

• Pace your deferrals to the finish line. Elective deferrals must be made through payroll by December 31. If you front-loaded and are about to hit the limit in October, check whether your plan offers a true-up; if it does not, you may forfeit part of your employer match by finishing early.
• Take your required minimum distribution. RMDs generally begin at age 73 and are due by December 31, with a one-time extension to April 1 for your first year only. The penalty for missing one is a 25% excise tax on the shortfall, reduced to 10% if you correct it within the correction window and file the required return.
• Consider a qualified charitable distribution. From age 70 and a half, you may direct up to $111,000 in 2026 from an IRA straight to charity. It counts toward your RMD and never appears in your adjusted gross income, which is a better outcome than donating and deducting for most people who take the standard deduction.
• Harvest losses deliberately, not frantically. Realized losses offset realized gains, and up to $3,000 of net loss can offset ordinary income each year, with the remainder carried forward. Mind the wash sale rule, which disallows the loss if you buy a substantially identical security within 30 days before or after the sale.
• Remember the IRA deadline is not December 31. You have until the April filing deadline to make a prior-year IRA contribution. It is the one retirement lever that stays open into the new year.

The theme, as ever, is that the calendar does the enforcing. Everything on this list is easy in August, awkward in November, and impossible on January 2.