Published November 9, 2026 · Educational perspective.
April is typically when calendar-year individuals report the prior year’s income and pay any remaining balance. It is not the best moment to begin considering decisions that could have been evaluated before year-end. For families managing $25 million or more across businesses, investments, and trusts, those decisions rarely belong to one account or one adviser.
September is a useful checkpoint, not a statutory planning cutoff or an instruction to wait until fall. Planning belongs throughout the year, especially before a major transaction. The September review creates time to update projections and coordinate execution before the calendar year ends on December 31.
Update income and payment projections
Start with what has changed since the last tax return: business earnings, investment sales, compensation, and expected fund income. A projection should distinguish confirmed amounts from estimates and identify information still missing.
For many calendar-year individuals who owe estimated taxes, September 15 is normally a federal payment date—not a universal deadline. Fiscal-year rules, special circumstances, disaster relief, and state requirements can differ. Uneven income may also require a different payment calculation.
Ask your CPA to review withholding, estimated payments, and the remaining projected liability. A filing extension provides additional time to submit a return; it does not, by itself, extend the payment deadline.
Review investments before placing trades
Look at realized gains, available capital losses, prior-year loss carryovers, and expected fund distributions together. Realizing an investment loss may help offset capital gains, but its usefulness depends on the applicable netting rules and the taxpayer’s circumstances. A trade should still make sense for the portfolio.
Wash-sale rules require particular care. A loss on stock or securities can be disallowed when substantially identical holdings are acquired within 30 days before or after the sale. Relevant purchases can include those in another account, an IRA, or by a spouse. Coordinate automatic reinvestments and trading across accounts rather than assuming one brokerage statement captures everything.
The objective is an informed after-tax decision, not a transaction justified solely by a projected tax benefit.
Connect business income to available cash
Business and private-investment income should be reviewed alongside actual distributions. Partnership distributions are separate from a partner’s share of income; taxable income can arise without an equivalent cash payment. Waiting for a final Schedule K-1—the statement reporting an owner’s share—can leave too little time to arrange liquidity.
Request updated estimates from business accountants and fund managers. Compare likely tax obligations with accessible cash, operating needs, debt payments, and capital commitments. Do not assume an illiquid holding can be sold when a payment comes due.
Proposed business expenditures also deserve review. Their timing and treatment require the business’s tax adviser, not a blanket instruction to spend before December. Preserving cash may matter more than pursuing a possible deduction.
Coordinate giving and ownership continuity
Philanthropy starts with the family’s charitable purpose. Then evaluate the asset to give, the recipient’s ability to accept it, and the documentation needed. Charitable contributions generally belong to the year actually made, subject to applicable carryover rules; a pledge is not necessarily a completed contribution. Noncash gifts may require appraisals and additional reporting, with exceptions that depend on the property.
Ownership transfers deserve similar preparation. Before gifting a business interest or other significant asset, review valuation, transfer documents, potential reporting, and who will hold decision authority afterward. IRS guidance emphasizes coordination among legal, tax, and valuation professionals for complex gifts.
A tax result should support continuity, not create an ownership arrangement the family cannot comfortably govern.
A practical September checklist
Use the checkpoint to assign concrete work rather than collect a new list of strategies:
Refresh the projection.
Gather year-to-date income, realized gains, prior loss carryovers, and expected business or fund income. ### Review payments.
Have the CPA assess withholding, estimates, applicable deadlines, and possible underpayment exposure. ### Coordinate investments.
Review potential sales, portfolio needs, and purchases that could trigger wash-sale treatment. ### Reserve liquidity.
Identify the cash source for taxes alongside business obligations and capital calls. ### Schedule giving and transfer work.
Confirm recipient acceptance, required valuations, legal documents, and completion timing. ### Assign responsibility.
Name the person responsible for each next step and establish a follow-up date.
Starting now: November and December
As of November 9, 2026, September has passed—but useful work remains. Arrange an updated adviser review now, identify what can realistically be completed before year-end, and confirm each action’s actual deadline. Do not rush a complex gift or investment merely to fit December. Some actions have later deadlines: eligible IRA contributions, for example, generally can be made through the following year’s return-filing deadline, excluding extensions. That does not establish contribution eligibility or deductibility.
The lasting discipline is year-round coordination. April remains important for reporting and payment; it should not be the first time the family sees how its decisions fit together.
This article is educational, not personalized tax, legal, accounting, or investment advice. Consult your independent qualified tax and legal advisers before acting. Federal and state rules, eligibility, timing, and outcomes depend on current law and your circumstances.
Primary sources
IRS — Get an extension to file your tax return
IRS — When are quarterly estimated tax payments due?
IRS — Topic no. 306, Penalty for underpayment of estimated tax
IRS — Publication 550, Investment Income and Expenses, 2025 edition
IRS — Publication 541, Partnerships, December 2025 edition
IRS — Publication 526, Charitable Contributions, 2025 edition
IRS — Frequently asked questions on gift taxes
IRS — Traditional and Roth IRAs
The linked IRS publications describe general mechanisms; they are not a statement of current-year deduction amounts, tax rates, or individual eligibility. Confirm current rules with qualified advisers.