Is Market Timing Halal? Hull and Qiao's Practitioner's Defense of Return Predictability, Leg by Leg, and the Fund That Earned Nearly Three Dollars of Interest for Every Dollar of Dividends: A Sharia Analysis for Muslim Investors (2026)

Verdict: The forecast is not the leg that fails. Three legs of Hull and Qiao's strategy do. The long position above 100 percent needs borrowed money or futures. A future is a binding contract to trade later. The short position sells what the investor does not own. SPY, the fund it trades, holds conventional banks. A long-only version in a screened fund avoids all three. A screened fund excludes companies that fail Sharia tests. On this article's reading, its idle cash must earn no interest. No published source reports how that version performs. Two questions stay open. The first is whether a timer pays zakat, the yearly obligatory alms, as a trader. The second is whether trading on a forecast is speculation.

In 2017 The Journal of Portfolio Management published "A Practitioner's Defense of Return Predictability" by Blair Hull and Xiao Qiao. Its abstract makes a claim at odds with the passive case: "there is substantial predictive power in combining forecasting variables." Hull's firm summarised the result: "From 2001 to 2015, annual returns of the simulated CS strategy (12.11%) are more than twice that of buy-and-hold (5.79%), with half of the volatility." The authors still "maintain that it is difficult to implement."

Hull's firm runs a fund in the same field. An ETF is a fund traded on a stock exchange. The Hull Tactical US ETF, ticker HTUS, reported net assets of $137,951,217 on 30 April 2026. In the six months to that date it earned $1,021,947 of interest and $354,225 of dividends. That is nearly three dollars of interest for every dollar of dividends. Its report does not say that the fund runs the paper's model unchanged.

The passive case, which refuses to time markets at all, is the subject of post 67. This post reads the paper's strategy one leg at a time and asks which legs a Muslim investor can keep.

What the Hull and Qiao Strategy Actually Is

Return predictability is the claim that market returns are partly forecastable. The full paper sits behind a paywall. This analysis relies on the abstract and the firm's executive summary. No sentence below quotes the body of the paper.

The model starts from 20 variables proposed in earlier academic work. The firm's summary groups them into price ratios, interest rates, the real economy, technical signals and a miscellaneous group that includes "Sell in May". Correlation screening keeps only variables linked to returns. The threshold is "at least a 10% correlation with our forecasting target".

The target is the equity risk premium six months ahead. The equity risk premium is stock return above cash. The summary describes the target as "130-ahead market excess returns". "The model is refit every 20 days using 10 years of data."

The test is a walk-forward simulation. A walk-forward test uses only then-available data. The simulated strategy holds SPY "proportional to our return forecasts". The summary adds one limit: "The strategy is capped at 150% long and 50% short SPY." On a £10,000 account, the long cap is 1.5 x 10,000 = £15,000 of exposure. The short cap is 0.5 x 10,000 = £5,000 of SPY sold short.

Measure, 2001 to 2015	Strategy	Buy and hold SPY
Annual return	12.11%	5.79%
Sharpe ratio	0.85	0.21
Annualised maximum drawdown	21.12%	55.20%

The Sharpe ratio is excess return per unit of risk. A drawdown is a fall from a previous peak. The ratio of returns is 12.11 / 5.79 = 2.09, so "more than twice" holds. The ratio of Sharpe ratios is 0.85 / 0.21 = 4.05, the "four times" in the abstract.

Look-ahead bias is using information not yet available. The authors tested for it by "including variables only as they are discovered in the literature". "Results show similar annual returns and Sharpe ratios."

The summary does not split the return by leg. It does not say how the position above 100 percent was financed, how the short was made, or what idle cash earned. Each gap is a separate question of fiqh, Islamic commercial law.

The Property Question

Between zero and 100 percent, the investor owns SPY units. SPY holds the whole S&P 500. State Street's holdings file for 16 October 2026 lists JPMorgan Chase at 1.37 percent of the fund, beside other conventional banks. Mufti Taqi Usmani's first condition for shares is direct: "it is not permissible to acquire the shares of the companies providing financial services on interest, like conventional banks" (An Introduction to Islamic Finance, 1998, p. 143). The remedy is a screened S&P 500 fund. Post 74 reviews one, SPUS.

Below zero, the investor sells SPY units that they do not own. A short sale sells borrowed shares to rebuy them cheaper. Hakim ibn Hizam asked the Prophet, peace be upon him, about selling goods he did not yet have. The answer was:

لاَ تَبِعْ مَا لَيْسَ عِنْدَكَ

"Do not sell what is not with you." (Jami' at-Tirmidhi 1232. Darussalam grades it Hasan, a reliable grade.)

Usmani states the rule as a condition of sale: "The subject of sale must be in the ownership of the seller at the time of sale. Thus, what is not owned by the seller cannot be sold." (p. 67). He also names "short sales" among the "divine restrictions" (p. 11).

An inverse ETF does not escape the rule. An inverse ETF rises when its index falls. A Darul Fiqh answer, reviewed and approved by Mufti Faraz Adam, rules: "It is not permissible to invest in inverse ETFs, stock options and naked options." It gives the reason: "Investing in inverse ETFs is similar to holding various short positions".

The Riba Question

Riba is a stipulated excess paid on a loan. The strategy meets it in three places.

The first is the long leg above 100 percent. On the £10,000 account, the long cap needs 15,000 - 10,000 = £5,000 more than the investor has. A broker's margin loan, credit against your shares, is a qard, a loan repaid in like kind. AAOIFI Shari'ah Standard No. 19, Loan (Qard), issued 19 May 2004, defines it in clause 2: "Qard is the transfer of ownership in fungible wealth to a person on whom it is binding to return wealth similar to it." Clause 4/1 opens: "The stipulation of an excess for the lender in loan is prohibited, and it amounts to Riba". The clause goes on to cover every form, timing and medium of the excess.

Sheikh Joe Bradford writes that leverage "is simply a loan that amplifies both potential profits and losses." Of a broker who lends at an explicit rate, he writes: "This is the definition of Riba and there is no other way to characterize it." (Crypto, Futures, and Leverage, joebradford.net, 11 February 2024). His subject was currency and crypto trading. This article reads his broker loan as the same loan an equity margin account uses.

Futures are the other route to 150 percent. HTUS held 165 long E-mini S&P 500 futures at 30 April 2026. A derivative is a contract priced off another asset. The Darul Fiqh answer reports that AAOIFI Standard No. 20 "prohibits derivatives on the basis that they constitute binding promises that are converted into sale contracts pertaining to the future without offer and acceptance." This article did not read Standard 20 itself, so the attribution rests on that answer.

The second place is idle cash. Below 100 percent, the rest of the account is cash. The summary does not say what that cash earned. HTUS shows what one fund did with it. It held 18.08 percent of net assets in United States Treasury bills. A Treasury bill is a short loan to the government. The fund's investment income for six months was 1,021,947 + 354,225 = $1,376,172. Interest was 1,021,947 / 1,376,172 = 74 percent of it. Applying clause 4/1 to a Treasury bill is this article's step. No source read disputes it.

The third place is the inputs. The model reads bond yields, the term spread and the default spread. Reading a rate is not lending at one. That is this article's reading. No cited scholar addresses a rate used only as a forecasting signal.

The Gharar Question

Gharar is excessive uncertainty in a contract's terms. Usmani places it in the contract. A sale made contingent on a future event "leads to uncertainty (gharar) in the transaction which is totally prohibited in Shari'ah" (p. 62). He also writes: "The certainty of price is a necessary condition for the validity of a sale." (p. 70).

A spot purchase is a purchase at today's price. A spot purchase of a fund unit has a known price and a known subject. The forecast changes how many units the investor buys. It does not change the terms of any purchase. On that reading, the model adds no gharar to a long-only trade. This is the article's application of Usmani's rules, not his ruling on timing.

The derivative routes differ. The Darul Fiqh answer lists "Gharar Fahish (excessive uncertainty)" among the elements it finds in derivatives. Futures and inverse ETFs are derivatives.

The Maysir Question

Maysir is gambling: gain or loss by chance. Allah says in Surah Luqman, verse 34:

إِنَّ ٱللَّهَ عِندَهُۥ عِلۡمُ ٱلسَّاعَةِ وَيُنَزِّلُ ٱلۡغَيۡثَ وَيَعۡلَمُ مَا فِي ٱلۡأَرۡحَامِۖ وَمَا تَدۡرِي نَفۡسٞ مَّاذَا تَكۡسِبُ غَدٗاۖ وَمَا تَدۡرِي نَفۡسُۢ بِأَيِّ أَرۡضٖ تَمُوتُۚ إِنَّ ٱللَّهَ عَلِيمٌ خَبِيرُۢ

"Indeed, Allāh [alone] has knowledge of the Hour and sends down the rain and knows what is in the wombs. And no soul perceives what it will earn tomorrow, and no soul perceives in what land it will die. Indeed, Allāh is Knowing and Aware." (Saheeh International)

The paper claims a statistical edge, not knowledge. Its summary still reports a maximum drawdown of 21.12 percent. Two readings of the verse are possible here, and both are this article's. On the first, the verse denies certain knowledge of tomorrow's earnings, and a probability estimate does not claim that knowledge. On the second, a model that borrows to hold 150 percent acts as if it knew. No scholar cited here applies the verse to return forecasting.

Usmani's view on options joins prediction to a missing asset. The Darul Fiqh answer reports his view in Fiqh al-Buyu' that options "resemble gambling more than they do trading given that the seller of the option does not own the commodity that he committed to sell, and he only entered into this arrangement on the basis of future predictions regarding the commodity price". Put options let holders sell at a set price. HTUS held S&P 500 put options, bought and written, at 30 April 2026.

Where Scholars Differ

No cited scholar published a ruling on long-only market timing. Three questions follow from that silence.

The first is zakat. Sheikh Joe Bradford draws the line by "intent and holding period" (How We Calculate Zakat on Stocks, joebradford.net, 4 March 2026). For a passive investor in funds, his proxy is market value x 30 percent = zakatable amount. Then zakatable amount x 2.5 percent = zakat due. For an active trader, "the full market value of the portfolio on the zakat date is zakatable."

A timer fits both of his lists. It owns index funds without "actively managing individual positions", which is on his passive list. It also trades on price forecasts, for what his active list calls "short-term price appreciation". On the £10,000 account, the passive route gives 10,000 x 0.30 = £3,000, and 3,000 x 0.025 = £75. The trader route gives 10,000 x 0.025 = £250. The gap is 250 - 75 = £175 a year. Post 59 covers the trader and investor line in general and leaves this edge open too.

The second is purification. Purification means giving away a holding's impermissible income share. Usmani reports two views on capital gains (pp. 145 to 146). The first holds that purification "is necessary, because the market price of the share may reflect an element of interest". The second holds that "no purification is required if the share is sold". He concludes: "Although this second view is not without force, yet the first view is more precautious and far from doubts." Usmani also writes that equity fund profits "are mainly derived through the capital gains" (p. 141). A timer realises gains each time it cuts its position, so the choice of view matters. Post 2 covers purification in general.

The third is speculation. Usmani lists "speculative transactions" among the prohibitions (p. 11), and he does not define them in that passage. He also writes that "the purchase and sale of shares is permissible in Shari'ah" subject to his conditions (p. 145). The options passage, as Darul Fiqh reports it, joins prediction to the absence of ownership.

On one reading, the prohibition attaches to the contract: the short sale, the future and the option. A long-only timer buys and sells owned units at spot, so it stays outside. On the other reading, "speculative transactions" is wider. Buying and selling only on a six-month price forecast may then fall inside it. The sources read here do not settle which reading is right.

What Remains Impermissible

Under the sources above, these legs of the paper's strategy remain impermissible:

the short leg, by borrowed shares or by an inverse ETF
the long leg above 100 percent, by margin loan
the long leg above 100 percent, by futures, on the Darul Fiqh answer's report of AAOIFI Standard 20
interest on idle cash, including Treasury bills
SPY itself, because it holds conventional banks
options, bought or written

HTUS's report at 30 April 2026 shows SPY, Treasury bills, long and short futures and put options. On these grounds the fund is not a candidate for a Muslim investor while it holds them.

Practical Guidance

Can I keep the forecast? On this article's reading, yes. The model involves no contract until you trade. The wider reading of "speculative transactions" may disagree. If that reading concerns you, ask a scholar before you trade.

What must change? Make these changes to the paper's rules:

Cap your position at 100 percent of your own money.
Set the floor at zero, not 50 percent short.
Replace SPY with a screened S&P 500 fund.
Keep idle cash in an account that pays no interest.

Which funds pass? Check every fund you hold on the stock screener. Avoid a fund that invests in Treasury bills, futures or options. If you time crypto, the same legs raise the same problems. Check the coin itself on the crypto screener.

What return should I expect? Do not use 12.11 percent. That figure came from a strategy with leverage, a short leg and SPY. No published source reports the long-only screened version. Test that version yourself before you commit money.

Which zakat method applies? Write down why you hold each position. If your answer is short-term price gain, read Bradford's active list closely. If you remain unsure, ask a scholar with your trading record in hand.

Should I purify gains? Choose between Usmani's two views before you trade. If you follow his preferred view, purify capital gains as well as dividends. Post 51 explains how to apply a fund's published purification ratio.

Conclusion

Hull and Qiao make a careful case that markets are partly forecastable. They call the strategy "difficult to implement". For a Muslim investor, it is harder. The leverage, the short leg, the interest on cash and the unscreened SPY all fail on the sources cited here. What survives is a forecast steering a long-only position between zero and 100 percent in a screened fund. Two questions stay open because the sources leave them open: the zakat class of a timer, and speculation.

This analysis is educational. It is not a religious ruling or financial advice.

Frequently Asked Questions

1. Is market timing halal?

No cited scholar ruled on long-only timing. Short selling, margin loans and interest on cash fail under the sources here. Whether trading on a forecast is speculation remains open.

2. Can I short the market with an inverse ETF instead?

No. A Darul Fiqh answer approved by Mufti Faraz Adam rules that investing in inverse ETFs is not permissible. It treats them as similar to holding short positions.

3. Can I use margin to reach 150 percent?

No. A margin loan is a qard with interest, which AAOIFI Standard 19 clause 4/1 calls riba. On £10,000, the 150 percent cap needs £5,000 borrowed.

4. Is Hull Tactical's ETF, HTUS, halal?

Not on the sources here, judged by its April 2026 report. It held SPY, Treasury bills, futures and options. Interest was 74 percent of its investment income for the six months.

5. Do the paper's returns apply to a halal version?

Not directly. The 12.11 percent came from a strategy with leverage, a short leg and SPY. No published source reports a long-only screened version. Test it before you rely on it.

6. Do I pay zakat as a trader if I time the market?

This is open. Bradford's passive route gives £75 on £10,000. His trader route gives £250. Ask a scholar with your trading record before you decide.

7. Does using interest rates in the model make it haram?

On this article's reading, no. Reading a rate is not lending at one. No cited scholar addresses rates used only as a forecasting signal.