45 Day Rule Calculator
Two different tax rules share the name “45-day rule,” and they punish a missed date in exactly the same way: the whole benefit disappears. In Australia, it is the holding period rule for franking credits: hold shares at risk for at least 45 days inside the window around the ex-dividend date, or lose the franking tax offset. In the United States, it is the 1031 exchange deadline: identify replacement property within 45 calendar days of selling, or lose the tax deferral. This page is built around the Australian franking calculator, because that is the tool this page has always run, and it also gives 1031 searchers the exact deadline math further down so nobody leaves with the wrong rule.
The 45 Day Rule Calculator below takes your actual dates, not a rough day count. Enter the buy date, the sell date (or the date you plan to sell), and the ex-dividend date, and it counts the days that truly count: held at risk, inside the 45 days before to 45 days after the ex-dividend date, with the purchase and sale days excluded. It handles the 90-day preference share version and the $5,000 small shareholder exemption in the same verdict.
General information only, not tax advice. Shares must be held at risk: hedging that removes your exposure can disqualify the holding period, and related payment and dividend washing rules can also apply. Confirm your position with your accountant or the ATO.
Quick Answer
Key takeaways
- Only days inside the ex-dividend window count. The window is 45 days before to 45 days after the ex-dividend date, and the buy and sell days never count.
- Ordinary shares need 45 qualifying days. Certain preference shares need 90 qualifying days under the same mechanics.
- If your total franking credits for the income year are $5,000 or less, the small shareholder exemption means the holding period rule generally does not apply.
- Holding for a long time is not enough on its own. A holding that sits mostly outside the window can score far fewer qualifying days than total days held.
- Looking for the US property rule instead? A 1031 exchange gives you 45 calendar days from closing to identify replacement property in writing. The dates table further down works that version too.
- Quick Answer
- What the 45-day rule actually requires
- The counting method, step by step
- Worked example: buying before the dividend and selling in March
- Why dates beat a simple day count
- The $5,000 small shareholder exemption and the at-risk test
- Here for the 1031 exchange 45-day rule instead?
- What this calculator covers, and why each part matters
- Frequently asked questions
- Add This Calculator to Your Website
- References
What the 45-day rule actually requires
You must hold the shares at risk for at least 45 days during the qualification period to claim the franking tax offset. That is the short version the Australian Taxation Office uses in its rules on claiming a franking credit refund, and every word in it does work. At risk means your money is genuinely exposed to the share price. The 45 days excludes the day you bought and the day you sold. And the days have to fall inside the qualification period tied to the ex-dividend date, which is why this calculator asks for three dates instead of one day count.
The rule has applied to shares acquired on or after 1 July 1997, and it exists for one reason: to stop dividend stripping. Without it, an investor could buy shares just before a dividend, collect the franking credits, sell straight after, and claim a tax benefit for a holding that lasted a weekend. The 45-day test forces a real holding with real exposure before the offset is allowed. If the test fails, the franking credits attached to that dividend are simply not claimable, even though the cash dividend itself is still yours and still taxable.
Two companion rules sit next to it. The related payments rule applies when you are obliged to pass the dividend benefit on to someone else, and it uses a secondary qualification period. The dividend washing rule stops you collecting two sets of credits by selling and quickly repurchasing substantially identical shares. This calculator tests the main holding period rule. If a related payment or a wash sale is part of your situation, the calendar check alone is not the whole answer.
The counting method, step by step
The calculator counts in four steps, and you can follow each one on a calendar. The trap in hand counting is step three: most failed claims do not fail on total time held, they fail on overlap.
Count total days held. Take the calendar gap between the buy date and the sell date, then subtract 1. Buy 1 Feb and sell 19 Mar and the gap is 46 days, so days held = 45. The subtraction removes one of the two endpoint days, because neither the acquisition day nor the disposal day counts.
Draw the qualification window. Go 45 days back from the ex-dividend date and 45 days forward. For an ex-dividend date of 15 Feb 2026, the window runs from 1 Jan 2026 to 1 Apr 2026. Only days inside this window can qualify.
Count the overlap. Your countable holding runs from the day after purchase to the day before sale. Intersect that span with the window and count what is left. In the worked example the whole holding sits inside the window, so the overlap is the full 45 days.
Compare with the requirement. Qualifying days of 45 or more pass for ordinary shares. Preference shares need 90. If the small shareholder exemption applies, this comparison is skipped entirely.
Worked example: buying before the dividend and selling in March
The calculator above is pre-filled with this exact case, and every figure below is what it returns when you press Calculate: buy 1 Feb 2026, ex-dividend date 15 Feb 2026, sell 19 Mar 2026, ordinary shares, no exemption.
| Figure | Value |
|---|---|
| Buy date to sell date gap | 46 days |
| Days held (gap minus 1, endpoints excluded) | 45 |
| Qualification window (ex-div 15 Feb 2026, plus and minus 45 days) | 1 Jan 2026 to 1 Apr 2026 |
| Qualifying days inside the window | 45 |
| Required for ordinary shares | 45 days |
| Verdict | Eligible |
Now move only the sell date. Sell on 18 Mar instead and days held falls to 44 and qualifying days falls to 44: not eligible, short by a single day. Switch the share type to preference shares with the same three dates and the requirement jumps to 90, so the same holding fails by 45 days. The boundary really is this sharp, and it is why a one-day counting error at tax time can cost the entire offset on that parcel. If you are checking what the dividend itself is worth once eligibility is settled, a dividend profit calculator puts the cash and credit side into dollars.
Why dates beat a simple day count
A day count cannot see the window, and the window is where claims quietly fail. Consider an investor who buys on 1 Nov 2025, holds right through to 30 Apr 2026, and sells then: roughly 179 days held, which sounds comfortably safe. If the ex-dividend date was 15 Nov 2025, the window closed on 30 Dec 2025, and only the part of the holding up to that date counts. The qualifying total is still well above 45 here, so this investor passes. Now shrink the same pattern: buy 1 Nov, ex-dividend date 15 Oct, sell 20 Dec. Days held is 48, which looks like a pass, but the window ended on 29 Nov, so only 28 of those days fall inside it. Result: 28 qualifying days, not eligible. Same investor behaviour, opposite answer, and only a date-based check can tell them apart.
There is a second timing lesson hiding in the window: buying earlier does not always help. Days before the window opens earn nothing toward this dividend, no matter how long you have owned the shares. What matters is exposure inside the window itself. Investors who drip-feed purchases in parcels should also note that each parcel is tested on its own dates. A parcel bought two days before the ex-dividend date starts its count in a very different place from a parcel held for a year, even though both receive the same dividend.
The $5,000 small shareholder exemption and the at-risk test
If your total franking credit entitlement for the income year is $5,000 or less, the holding period rule generally does not apply to you at all. The threshold is on your total credits for the year across all holdings, not per company and not per dividend. Tick the exemption box in the calculator and the verdict is eligible regardless of dates. Two cautions still apply: the exemption is assessed per income year, so a bigger portfolio in a later year can bring the rule back, and other integrity rules can still affect a claim.
Positions that normally count as at risk
- You own the shares outright and carry the full gain and loss while you hold them.
- Your exposure stays at or above the level the ATO describes for qualified person status, with no arrangement stripping it away.
- You hold through the ex-dividend date as the genuine economic owner of the parcel being tested.
Arrangements that can break the test
- Hedges, puts, or offsetting positions that substantially remove your risk of loss or chance of gain.
- An obligation to make a related payment that passes the dividend benefit to another party.
- Dividend washing: selling a holding and promptly buying back substantially identical shares to duplicate credits.
The ATO puts the at-risk idea plainly: you need to carry a real share of the risks of loss and the opportunities for gain, commonly described as at least 30 percent of the risk and opportunity staying with you. A protective put bought purely to survive the 45 days is the classic way people accidentally fail a test they thought was only about dates. If any part of your holding is hedged, treat the calculator result as a calendar check only and get advice on the at-risk side separately. For the wider tax picture on a share sale, the capital gains loss calculator covers the gain or loss side that sits alongside the franking question.
Here for the 1031 exchange 45-day rule instead?
Same name, different country, different tax. Under section 1031 of the US Internal Revenue Code, an investor who sells investment property has 45 calendar days from the closing date to identify replacement property in writing to a qualified intermediary, and 180 calendar days in total to close on it. The count is calendar days, weekends and holidays included, and missing the identification deadline kills the deferral even if the purchase itself would have been on time. The Internal Revenue Service sets out the like-kind exchange framework in its like-kind exchanges guidance, and the identification limits most investors use are the three-property rule, the 200 percent rule, and the 95 percent rule.
| If you close the sale on | 45-day identification deadline | 180-day completion deadline |
|---|---|---|
| 1 Mar 2026 | 15 Apr 2026 | 28 Aug 2026 |
| 1 Jun 2026 | 16 Jul 2026 | 28 Nov 2026 |
| 15 Oct 2026 | 29 Nov 2026 | 13 Apr 2027 |
That last row is deliberate: for a mid-October closing, the 180-day date runs into the following tax year, and the real completion deadline can be the earlier of 180 days or your tax return due date, so confirm it with your intermediary rather than trusting a single added date. Note what this table cannot do: it cannot check a franking claim, and the franking calculator above cannot certify a 1031 deadline. The two rules share a number and nothing else. If your question is how much property your sale proceeds need to target next, the 2 percent rule real estate calculator is a rough screening tool some investors run on candidate replacements, and remember that both systems count calendar days, not business days, which is why a 45-day deadline lands about six and a half weeks out, not nine.
What this calculator covers, and why each part matters
This calculator takes the three actual dates, builds the window, and reports total days held and qualifying days as two separate numbers, because they are two separate tests.
Real dates and the real window. Enter the buy date, the sell date, and the ex-dividend date. The tool builds the qualification window, 45 days before to 45 days after the ex-dividend date, and counts only days held at risk inside it, with the purchase and sale days excluded, so holding long enough overall but partly outside the window is caught, not passed.
All three rule variants in one verdict. The share type picker covers the standard 45-day ordinary share case and the 90-day preference share requirement, and the $5,000 small shareholder exemption checkbox feeds the same verdict, so a preference shareholder and a small shareholder get an answer built for their rule.
Both rules named up front. This page names both rules that share the name up front and keeps the franking tool this URL has always run, while giving 1031 readers the closing plus 45 and closing plus 180 date table in the same visit, with the tax return due date catch included.
One limit applies to this calculator too: no date calculator can judge the at-risk test, a related payment obligation, or a dividend washing arrangement. Those turn on contracts and conduct, not calendars, and they are the part of a borderline claim worth paying an accountant to review.
Frequently asked questions
You must hold shares at risk for at least 45 days, excluding the buy and sell days, during the qualification period around the ex-dividend date, to claim the franking tax offset. The calculator counts only the days that fall inside the window from 45 days before to 45 days after the ex-dividend date. The rule has applied to shares acquired on or after 1 July 1997.
No. The day of acquisition and the day of disposal are both excluded. Buy on 1 Feb 2026 and sell on 19 Mar 2026 and the calendar gap is 46 days, but days held is 45. Sell on 18 Mar and days held is 44, which fails the test for ordinary shares.
It is the period from 45 days before the ex-dividend date to 45 days after it. Only at-risk days inside this window count toward the 45 days. Holding shares for months outside the window earns nothing toward that dividend, which is why a long holding can still fail and why this tool asks for the ex-dividend date, not just a day count.
If your total franking credit entitlement for the income year is $5,000 or less, the holding period rule generally does not apply to you. The limit is on all your franking credits for the year combined, not per share or per dividend. Tick the exemption box in the calculator and the verdict is eligible regardless of the dates.
Certain preference shares must be held at risk for at least 90 days instead of 45, under the same window mechanics. Pick Preference shares in the calculator and the requirement changes to 90 qualifying days. A holding that comfortably passes at 45 days can fail at 90, as the worked example shows.
It means your money is genuinely exposed to the shares: you carry a real share of the risk of loss and the opportunity for gain. Hedging arrangements, options, or related agreements that substantially remove that exposure can disqualify the holding period even when the dates are perfect. This calculator checks dates only and assumes genuine at-risk ownership.
No. They are unrelated rules that share a number. The franking 45-day rule is Australian and decides whether you can claim franking credits on a dividend. The 1031 rule is American: after selling investment property you have 45 calendar days to identify replacement property in writing and 180 days to close. The section above the FAQs gives the 1031 date table as well.
Yes, but it is a different test. For a US dividend to be qualified for lower tax rates, the stock generally must be held for more than 60 days during the 121-day period that begins 60 days before the ex-dividend date. It has nothing to do with franking credits, which are an Australian imputation feature.
No. Price movement does not affect eligibility. Only the holding period, the qualification window, and your at-risk status matter. A falling price may still matter for capital gains or losses when you sell, but it does not change the franking credit test.
No. It is general information that checks the calendar side of the holding period rule against the dates you enter. Related payments, dividend washing, and hedged positions can change the answer. Confirm a borderline claim with your accountant or the ATO before you rely on it.
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References
- Australian Taxation Office, “Rules and limits on claiming refunds: franking credit trading rules” – states the holding period rule, the 45-day and 90-day periods, and the primary and secondary qualification periods. ATO: Rules on Claiming a Franking Credit Refund. Accessed October 2026.
- Australian Taxation Office, Partnership Tax Return Instructions, Appendixes: “Franking credit trading” – defines qualified person status, the at-risk test, the 1 July 1997 start, and the $5,000 small shareholder alternative. ATO: Franking Credit Trading Appendix. Accessed October 2026.
- Intuit QuickBooks Australia, “Franking credits explained” – plain-language summary of the holding period rule, related payments rule, and dividend washing rule for individual shareholders. QuickBooks Australia: Franking Credits Explained. Accessed October 2026.
- HWLE Lawyers (Hall and Wilcox), “Your franking credits are at risk” – legal analysis of the primary qualification period and how hedging reduces at-risk days, with a worked example. HWLE: Franking Credits and the 45-Day Holding Period Rule. Accessed October 2026.
- Internal Revenue Service, “Like-kind exchanges: real estate tax tips” – the US framework behind the other 45-day rule: identifying and closing on replacement property in a section 1031 exchange. IRS: Like-Kind Exchanges Real Estate Tax Tips. Accessed October 2026.
- US Congress, Internal Revenue Code section 1031, “Exchange of real property held for productive use or investment” via Cornell Law Institute – the statute that sets the 45-day identification and 180-day exchange periods. Cornell LII: 26 USC 1031. Accessed October 2026.