Why dividend yield differs from site to site

How it works

A dividend yield is a fraction, and both halves are decisions.

The top is a dividend per share for a year. Nobody has next year's figure, so every source picks a stand-in:

• Forward, or indicated: the latest regular payment, annualised — a quarterly dividend times four, a monthly one times twelve. Nasdaq's glossary defines the indicated dividend as what would be paid over the next 12 months "if each dividend were the same amount as the most recent dividend", and the indicated yield as that annual figure divided by the price.
• Trailing twelve months: the sum of the payments that went ex-dividend, or were paid, in the last twelve months.
• Forecast: an analyst's or the vendor's estimate of each coming payment, added up.

Then three sub-choices that are rarely printed: whether a special dividend counts, which of a dividend's dates moves it into or out of the window, and in which currency it is counted.

The bottom is a price: yesterday's close, a live or delayed quote, or for a fund its NAV. A yield computed this morning on yesterday's close and one computed at noon on the live price differ by however far the stock has moved.

Funds add a third family. The 30-day SEC yield is not a dividend divided by a price at all; it is a standardised measure of income earned by the portfolio, net of expenses, and it can differ from what the fund actually paid out by a wide margin.

None of this is error. It is several definitions sharing a name.

Forward and trailing: the same payments, different numbers

Take a company paying $0.50 a quarter that announces a raise to $0.55, on a $50 share.

For most of the year after a raise, forward is higher than trailing; after a cut, lower. The gap closes only when four payments at the new rate have rolled through the trailing window. A company that pays the same amount every quarter shows the same yield on both — which is why the disagreement appears precisely when something has just changed, which is when people look.

Annualising has a second weakness: uneven schedules. A company that pays a small interim and a large final dividend, the common pattern outside the US, produces a forward figure that swings with whichever payment was last. Multiplying a semi-annual interim by two understates the year; doing the same with the final overstates it. A trailing sum is the safer default for those payers, and the dividend trackers section notes which products forecast each payment rather than extrapolating.

Which date moves the number

Every dividend has a declaration date, an ex-dividend date, a record date and a payment date. The ex-dividend date is the one that decides entitlement and the day the price drops by roughly the dividend; the payment date, often weeks later, is when cash arrives.

A trailing window keyed to ex-dates and one keyed to payment dates contain different payments for the weeks between the two: from the ex-date until the cash arrives, the first already counts a payment the second does not, and at the far end of the window it has already dropped one the second still holds. A forward figure can move on the declaration, before either. Corporate actions shift the same comparison again: a dividend history stored per share has to be divided by every split since, or the yield on it is out by the split ratio — the trap how to get split and dividend history as data covers.

Special dividends

A special dividend is a payment the company itself labels one-off. Costco's 10-Q for the quarter to 26 November 2023 records both kinds: a regular quarterly dividend of $1.02 per share, declared on 18 October 2023, and a special cash dividend of $15.00 per share declared on 13 December 2023 and payable on 12 January 2024.

Annualised, the regular dividend was $4.08. The special alone was more than three and a half times that. For twelve months, any trailing yield that counted it showed Costco as a different kind of stock from a forward yield built on the $1.02, and a forward yield that annualised the last payment of any kind — $15 times four — would have been absurd. Sources handle this three ways: exclude payments flagged as special, include everything paid, or leave it to whoever reads the number. Which one a source chose is usually visible only by finding a stock with a special in the last year and looking.

Funds: SEC yield, distribution yield and trailing yield

A fund can show three yields on one page, and they measure different things.

30-day SEC yield. Form N-1A, Item 26(b)(4), prescribes it: over a 30-day or one-month period, net investment income per share divided by the maximum offering price per share on the last day, annualised as 2[((a − b)/cd + 1)^6 − 1], where a is dividends and interest earned, b expenses accrued net of reimbursements, c the average daily number of shares entitled to dividends and d the maximum offering price. Bond interest is computed from each holding's yield to maturity rather than its coupon, and equity dividends are accrued. It measures what the portfolio is earning now, after costs, not what it paid. Rule 482 requires a current yield in an open-end fund's advertisement to use this computation, to name the length and end date of its base period, and to appear with quotations of total return and no more prominently than they do.

Trailing or distribution yield. What was actually paid. iShares defines its 12-month trailing yield as the income distributions of the past twelve months divided by the sum of the most recent NAV and any capital gain distributions over the same period. Other issuers and data sites annualise the latest distribution instead, and divide by NAV or by market price.

Why they part. On 6 October 2026 the iShares Core U.S. Aggregate Bond ETF's page showed a 30-day SEC yield of 5.10%, a 12-month trailing yield of 4.21% and an average yield to maturity of 5.52%. On 31 August 2026 the iShares Core S&P 500 ETF's showed 0.94% and 1.06%. When rates or dividends are moving, the 30-day figure reflects the portfolio held now and the trailing figure the portfolio held over the past year. iShares itself warns that its distribution and trailing yields may vary period to period with tax treatment, exceptional corporate actions, seasonality of underlying dividends, large changes in shares outstanding and capital gain distributions.

What a distribution is made of. A fund distribution is not necessarily income. Rule 19a-1 makes a management company paying from anything other than net income send a written statement saying what portion of each payment per share came from net income, from accumulated realised gains on sales of securities, and from paid-in surplus or other capital. A distribution yield counts all three; the SEC yield counts only the first. For a fund paying out capital, the distribution yield is the larger number and the less informative one.

Which price, which currency, whose tax

The price. A stock yield is divided by a share price taken at some moment, and sites rarely say which. A fund yield may be divided by NAV or by market price, which differ by the fund's premium or discount.

The currency. Shell declares its dividend in US dollars. For the second quarter of 2026 it declared $0.3906 per ordinary share and $0.7812 per American Depositary Share, each ADS representing two shares, announced on 30 July 2026. Holders could elect dollars, euros or sterling; by default, shares held through Euroclear Nederland were paid in euros, and shares on the register or in Shell's corporate nominee in sterling, with the sterling and euro amounts to be announced on 7 September — after the ordinary shares' ex-dividend date of 13 August and the ADSs' of 14 August. A yield on the London line divides a dollar dividend, converted at a rate not yet known on the ex-date, by a sterling price; a yield on the New York ADS divides a dollar dividend by a dollar price. Both are correct, and they need not match on any given day.

The tax. A published yield is gross. Dividend withholding is a property of the holder, not the security — the IRS starts foreign holders of US-source dividends at 30%, reduced where a treaty or a Code provision allows — so no shared database can publish a net yield that is right for everybody. A tracker that shows an after-tax yield is applying a rate you set. Tracking foreign dividends and the tax withheld from them covers recording the difference.

What each source says it uses

Each vendor's own documentation, read on 8 October 2026. Not documented means the vendor's public pages do not say, not that no choice was made.

The trackers apply the same choices to a portfolio, and are the only products here that say anything about tax.

Of all of these, only Stock Rover says when a forward figure moves: on declaration. None of the data APIs or screeners says whether its yield is gross or net of withholding. And Koyfin printing four labelled yields for one stock is the plainest statement on this list that a single ticker has several correct ones.

What you can do about it

Ask two questions of any yield before comparing it with another. Is the top forward, trailing or forecast — and are specials in it? Is the bottom a close, a live price or a NAV, and in which currency? If the page cannot answer, the number is not comparable with anything.

Use trailing for what a stock has done and forward for what it is paying now, and say which. Right after a raise or a cut, the two should disagree; the size of the gap is the change, not an error.

For uneven payers, use a trailing sum or a per-payment forecast, never the last payment multiplied up.

Check one special dividend. Look up a stock that paid one in the last twelve months on the source you rely on. If its trailing yield jumped and stayed up for a year, the source counts specials; if its forward yield jumped, it annualises them, and every forward figure it prints deserves a second look.

For a fund, read the SEC yield for income and the distribution history for cash, and if the distribution yield is well above the SEC yield, find the fund's Rule 19a-1 notices before treating the gap as income.

For your own portfolio, compute the yield from your own records. The dividends your broker actually paid, net or gross as you need, divided by a price you chose, is the one figure you can reconcile; tracking dividends across brokers covers collecting them.