The Basis Ledger

A reader wrote to me last spring in a genuinely bad mood. He had sold a chunk of company stock he had accumulated through an employee purchase plan over about nine years. Good sale, good price, he had done everything right on the buying side.

Then the tax form arrived and reported a cost basis of almost nothing. Not wrong exactly. Just incomplete in the specific way these forms are always incomplete. His broker reported what he paid at the discounted purchase price and ignored the fact that the discount had already been taxed as ordinary income on his W-2 years earlier.

If he had filed that form as printed, he would have paid tax twice on the same money. Roughly nineteen thousand dollars of tax on income he had already been taxed on once.

He caught it. Most people do not.

This is the part that surprises people, so let me be direct about it.

The cost basis number on your brokerage statement is not an authoritative record. It is your broker's best reconstruction, built from the information they happened to receive, subject to rules that changed partway through your investing life, and legally not their responsibility to get right in a large number of situations.

The responsibility is yours. It has always been yours. The broker reporting requirement that came in over a decade ago made things better, but it created a dangerous side effect: people started treating the reported number as the truth because it now appears on an official form.

Here is the split you need to understand.

Covered securities are ones your broker is required to track and report basis for. The requirement phased in by asset type. Stocks acquired starting in 2011. Mutual funds and dividend reinvestment plans starting in 2012. Most bonds and options starting in 2014.

Noncovered securities are everything acquired before those dates, plus a range of assets that fall outside the rules entirely. For these, your broker may report a basis, may report nothing, or may report something they inherited from a previous custodian and have no ability to verify. The form will flag the sale as noncovered, and that flag is the system politely telling you it does not know.

If you have been investing for more than fifteen years, you almost certainly own noncovered lots. If you have ever transferred an account between brokers, you own basis that traveled through a pipeline built for speed rather than accuracy.

Before the rebuild, know what you are looking for. Errors are not random. They live in specific places.

Account transfers. When you move an account, basis is supposed to travel with it. Sometimes it does. Sometimes it arrives partially. Sometimes the receiving broker gets the shares and no basis at all, and quietly shows you a zero or a blank. Every transfer in your history is a suspect.

Reinvested dividends. This is the single most expensive silent error in ordinary investing. Every reinvested dividend is a purchase. You were taxed on that dividend the year you received it, and that taxed money bought additional shares, so it adds to your basis. Someone who held a dividend fund for twenty years with reinvestment on may have hundreds of small purchase lots. Miss them and you overstate your gain by a large margin, paying tax on money that was already taxed.

Splits, spinoffs, and mergers. A split divides your basis across more shares, which is simple. A spinoff allocates your original basis between the parent and the new entity according to a ratio the company publishes in a document nobody reads. Mergers can be taxable or not depending on structure. Each of these events either adjusts basis or should have, and each one is a place where the chain breaks.

Inherited assets. Inherited property generally gets a basis step-up to the value on the date of death, which can eliminate decades of embedded gain. But somebody has to establish that value and record it. If nobody did, the broker may still be carrying the deceased's original basis, and you would be volunteering to pay tax on gains that legally vanished.

Gifted assets. Gifts do not get a step-up. You generally take the giver's basis. And there is a dual-basis rule that trips almost everyone: if the asset was worth less than the giver's basis at the time of the gift, you use one figure for computing a gain and a different figure for computing a loss. This rule exists specifically so people cannot transfer losses to each other, and it produces genuinely counterintuitive outcomes.

Employer stock. The scenario from the top of this email. With purchase plans and restricted stock, some portion of the value was already reported as ordinary income on your W-2. That amount must be added to your basis. Brokers frequently report only the cash you paid, or in the case of restricted stock, sometimes report zero. This is the most expensive error on the list and the most common.

Wash sales. Sell at a loss and buy a substantially identical security within thirty days before or after, and the loss is disallowed and added to the basis of the replacement shares. The rule reaches further than people think. It crosses account boundaries. It includes your spouse's accounts. It includes purchases inside your retirement accounts, where the disallowed loss is not added to anything and simply disappears forever. Automatic dividend reinvestment can trigger a wash sale without a single decision on your part.

Eight steps. Do them in order.

Only taxable accounts need this. Retirement accounts do not track basis for ordinary contributions because everything comes out under different rules. List every taxable brokerage account, every direct-with-the-fund-company holding, every transfer agent position from an old employer plan, and any crypto held anywhere. Include closed accounts you transferred out of, because that is where the original records live.

Not account summaries. Lot-level. Every broker has a report showing individual tax lots with acquisition dates and basis, though they usually bury it. You want acquisition date, quantity, reported basis, and covered or noncovered status for every lot.

Sort by that status flag. Every noncovered lot is a line item requiring your attention. Every zero or blank basis is an emergency.

For each unknown lot, work backward through whatever evidence exists. Old account statements, which many brokers retain online longer than people realize. Trade confirmations. The annual statements from dividend reinvestment programs, which are usually cumulative and can rescue an entire twenty-year position in one document.

If the records genuinely do not exist, you may reconstruct a reasonable basis from historical price data on the acquisition date, documented and defensible. What you may not do is guess, and you absolutely may not use zero as a shortcut, because zero means you pay tax on the entire proceeds.

This step is brutal document work. It is also the step where machines earn their keep. I run statement PDFs through Galaxy.ai and have it extract transactions into a clean table. Twenty years of reinvestment records go from a weekend to an afternoon.

For anything inherited, establish and document the date of death value. For securities that is a straightforward historical lookup. Write it down with the date, the source, and the calculation, because you may not sell for another fifteen years and you will not remember.

For gifted assets, get the giver's original basis and the value on the transfer date. Record both. You need both because of the dual-basis rule.

Find the W-2 for every year you had a purchase plan disposition or a restricted stock vest. Locate the compensation income that was reported. Add it to your basis for those lots.

Then verify the broker did not already include it, because occasionally they did and double-adding creates the opposite error. The supplemental information some brokers provide alongside the main tax form often contains the corrected figure, sitting in a document explicitly labeled as not being filed with the government.

Most brokers default to first in, first out. That default is rarely optimal and switching after a sale is not something you can do retroactively.

Specific identification lets you pick exactly which lots to sell, and it is the only method that gives you real control. To use it you generally have to identify the lots at or before settlement and get written confirmation from the broker. Doing it after the fact does not count.

The strategy underneath is situational. Selling the highest-basis lots minimizes the current gain, which is usually right when you want cash with minimum tax. Selling low-basis lots deliberately makes sense when you have losses to absorb them or you are sitting in one of the zero-rate windows we talked about Monday. And holding period matters independently, since the long-term rate structure is meaningfully better than the short-term one.

Go set the method to specific identification in every account today. It costs nothing and preserves every option.

Build one list of every security you hold across every account including your spouse's and your retirement accounts. That combined list is your wash sale universe.

Then turn off automatic dividend reinvestment in any taxable account holding a position you might harvest losses in. This one setting causes more accidental wash sales than deliberate trading does.

One spreadsheet. Columns for account, security, acquisition date, quantity, original basis, adjustments with reasons, adjusted basis, covered status, and a source note pointing at the document that proves it.

That source column is the whole point. A basis figure without a source is a guess wearing a suit.

Store it somewhere permanent and independent of your broker, because the broker who has your records today may not be your broker in twelve years. I have a scenario in Make.com that files monthly statements into the right folder automatically as they arrive, so the evidence trail builds itself rather than depending on my discipline.

Most financial optimization is probabilistic. You improve your odds, you do not know the outcome.

This is not that. Every dollar of basis you recover is a dollar of phantom gain you do not pay tax on. If you find twenty thousand dollars of unrecorded reinvested dividends, you have saved several thousand dollars in tax with certainty. It is not a bet. It is arithmetic that was always true, sitting unclaimed because nobody did the paperwork.

And the value compounds in an unusual direction. The longer you hold, the larger the embedded gain becomes and the more the basis error is worth. The best time to build this ledger was when you opened the account. The second best time is before you sell.

I built The Basis Ledger Build Kit to run this protocol without improvising. It contains the full ledger template with every column and a worked example, the account inventory checklist, the seven-failure diagnostic with the specific document that resolves each one, the employer stock correction walkthrough, the wash sale universe mapper, the lot method decision guide, and a reconstruction procedure for positions where records are genuinely gone.

Reply to this email with the word BASIS and I will send it your way.

The Grid Inner Circle is where this work stops being solitary. It is the paid community for people who actually build the systems rather than just reading about them, and basis reconstruction is exactly the kind of problem that goes faster when someone else has already hit the same wall.

It runs 29 dollars a month. The lifetime seat is 499 dollars, which pays for itself against the monthly price in about seventeen months and then stops costing anything ever again.

Reply with INNER CIRCLE for the details.

Pull one account this weekend. Just one. I would bet money you find something.

Alex Rivera
Wealth Architect at The Wealth Grid

This is educational content, not tax or investment advice. Basis rules are detailed and situation specific, and the treatment of employer stock, inherited property, and wash sales varies with facts. Work with a qualified tax professional before filing anything based on a reconstruction.