Arbitrage vs Liquid Funds — Which Suits Money That Is Waiting?

The mechanics are completely different, which is easy to miss because both are described as safe parking.

A liquid scheme lends very short term. It holds treasury bills, commercial paper and similar instruments maturing within a matter of weeks, so the value moves very little.

An arbitrage scheme buys a share and simultaneously sells a futures contract on the same share, locking in the small difference between the two prices. The equity exposure is cancelled out by design, which is why the value is relatively steady despite the scheme holding shares.

So one is a lender and the other is running an offsetting trade. Neither is promising a fixed outcome.

This is usually the deciding factor for short-term money.

Liquid schemes are built for quick exit. Redemptions are typically credited the next working day, and many schemes offer an instant facility for a limited amount, subject to the scheme own terms.

Arbitrage schemes take a little longer, usually a few working days, and many carry a short exit load in the first days or weeks, as our page on exit load explains.

For money that might be needed at short notice, that difference settles it. Our page on building an emergency fund covers why the buffer in particular belongs at the quickest end.

Both are steady compared with equity. They are not identical.

A liquid scheme value moves very little day to day because its holdings mature so soon. The main things that can disturb it are a credit problem in what it holds, which our page on credit risk covers, or a sharp change in short-term rates.

An arbitrage scheme return depends on how wide the price gap between the share and its futures contract happens to be, and that gap varies with market conditions. In quiet periods the opportunity narrows. The value rarely falls sharply, but the pace of gains is uneven and occasionally close to flat.

Neither category should be described as fixed. Both can produce a period where very little happens.

This is the main reason arbitrage schemes exist in most portfolios, so it is worth stating carefully.

An arbitrage scheme holds equity and derivatives, so it is classified as an equity scheme for tax. A liquid scheme is a debt scheme and is taxed on that basis. The two treatments differ, and the debt treatment in particular has changed more than once in recent years.

We do not quote rates or thresholds, because they change and because your position depends on your own circumstances. Our page on mutual fund taxation covers the structure, and the arithmetic for your case belongs with a tax adviser.

What we would say is that the tax advantage matters only if the money is going to sit for long enough to benefit. For a few weeks, the simpler option usually wins.

Three common situations.

The emergency buffer, or money needed within weeks. A liquid scheme or the bank. Speed and predictability matter more than anything else here.

A large amount waiting to be moved into equity gradually. Either works, and a systematic transfer plan can run from both. Arbitrage is often used where the transfer will take many months.

Money set aside for a known expense several months away. Worth comparing on tax treatment and exit load, and our page on short duration funds is a third option for that horizon.

Neither is a substitute for a deposit, and neither should be described as a safe alternative to one.

A deposit is a contractual arrangement with a bank. Both of these are market-linked schemes whose value is calculated daily. The probability of a meaningful fall is low, and low is not the same as none, which our page on mutual funds versus fixed deposits sets out.

There is also no version of either that pays a stated amount every month. Where somebody needs a regular sum from an accumulated holding, that is a withdrawal arrangement rather than a feature of the scheme, and our page on the systematic withdrawal plan covers it.

Neither is a place for long-term money either. Money that has a decade to work belongs where it can grow, and our page on asset allocation covers matching money to its date.

Four things on the fact sheet and scheme document.

The exit load, and how long it applies.

The expense ratio, which matters proportionally more when the expected return is small, as our page on expense ratio explains.

What the scheme holds, particularly the credit quality in a liquid scheme.

The redemption timeline, stated in the scheme document rather than assumed.

• Needed within days or weeks: liquid, or simply the bank.
• Parked for several months or longer: compare tax treatment and exit load, where arbitrage often fits.
• Either way: read the exit load and the redemption timeline before putting money in.
• Neither: for long-term money, or as a replacement for a deposit.

We are distributors rather than investment advisers and we recommend no schemes. If you have an amount waiting for a purpose and want to think through where it should sit, get in touch.