Why plans drift, plus ISOs, the pro-rata rule and Social Security

Most financial plans don’t fail in one bad month. They drift. A pilot who is one degree off course barely notices for the first few miles, and by the end of the flight is hundreds of miles from where they meant to land. Money works the same way: a contribution rate set two years ago, a beneficiary nobody updated, a job change that quietly rearranged the picture.

That’s why I like to see clients at least once a year, and why late October is a good time to look. There are still two months of paychecks left, and anything that has to be done by December 31 can still be done calmly. The correction is usually small. It just has to happen before the year closes.

Markets this week

For the trading week ending Friday, October 23, 2026:

• S&P 500: closed at 7,623.86, down 35.58 points (0.5%) for the week
• Dow Jones Industrial Average: closed at 52,209.16, up 206.75 points (0.4%) for the week
• Nasdaq Composite: closed at 25,955.34, down 184.69 points (0.7%) for the week

Closing levels from Reuters for October 23, 2026, and from the Associated Press and TheStreet for October 16, 2026.

ISOs and the AMT bill

Exercising incentive stock options and holding the shares creates no regular income tax. The IRS says it plainly: no income is recognized for regular tax when an ISO is exercised (IRS, Instructions for Form 6251, 2025). The catch is the alternative minimum tax, where the gap between your strike price and the market value on the exercise date counts as income. For 2026 the AMT exemption is $90,100 for unmarried filers and $140,200 for joint filers, and it phases out at higher incomes (IRS, news release IR-2025-103, October 9, 2025). No shares are sold, so the tax can arrive with no proceeds to pay it. Whether and when to exercise depends on your income, your company, and your grant terms.

How the AMT gets triggered, and what to confirm before year-end

Old 401(k)s and backdoor Roths

The pro-rata rule counts every traditional, SEP and SIMPLE IRA you own on December 31 of the conversion year, not on the day you convert (IRS, Instructions for Form 8606, 2025, line 6). A backdoor Roth you finished in March can turn mostly taxable if an old 401(k) is rolled into a traditional IRA in November. Balances sitting in an employer plan aren’t counted, which is why the direction a rollover travels matters. The 2026 IRA contribution limit is $7,500 (IRS, news release IR-2025-111, November 13, 2025). Whether a rollover makes sense depends on more than this rule, including what the old plan costs you.

What the rule measures, and which accounts count

A question people keep asking

Will Social Security run out?

Not in the sense the question suggests. Social Security is paid mostly from payroll taxes collected from current workers, and trust fund reserves cover the gap when benefits exceed what comes in. The 2026 Trustees Report projects the retirement fund’s reserves will be depleted in the fourth quarter of 2032, with 78 percent of benefits payable at that time, and the combined retirement and disability funds in 2034, unless Congress acts (Social Security Administration, press release, June 9, 2026). So the planning question isn’t whether the checks stop. It’s how your plan holds up if the benefit turns out smaller than your statement shows. The right answer depends on individual circumstances.

Worth a look this month

The IRS announced the 2026 retirement plan limits on November 13, 2025 (IRS, news release IR-2025-111). The 2027 figures aren’t out yet. When they are, they set your 401(k) and IRA room for next year, and a January contribution rate is easier to choose with the real numbers in front of you. In the meantime, it’s worth finding out when your employer’s open enrollment closes, since elections usually lock for the plan year.