Liquid funds vs Fixed Deposits (FDs): Where should CFOs keep surplus funds?

Most comparisons between liquid funds and fixed deposits focus entirely on returns, liquidity, and tax treatment, and those factors matter. But for a CFO specifically, the more important question usually isn't "which instrument earns more." It's "who decided this, under what mandate, and how is it being reviewed." Good idle cash management at the CFO level is as much about governance as it is about instrument selection.

This piece takes that governance-first angle: how CFOs should actually structure the decision, not just which product wins on paper.

Where should companies invest surplus cash? Start with a policy, not a product

Before comparing liquid funds and FDs, a CFO needs a documented framework for how surplus decisions get made in the first place. This isn't a purely private-sector concern; it's a formalized practice even in government-linked companies. A CAG report on the management of surplus cash in central public sector enterprises found that investment decisions above certain thresholds require board approval, while smaller, shorter-term investments can be delegated to designated officials, provided every delegated decision is reported back to the board at its next meeting. 

The specific thresholds don't translate directly to a private company, but the underlying principle does: surplus cash decisions should have a clear owner, a defined delegation limit, and a mandatory reporting loop back to leadership.

Without that structure, instrument selection becomes ad hoc; whoever's paying attention that quarter picks whatever feels safest or most familiar, which is a bigger risk to a CFO's credibility than picking a marginally lower-yielding option.

Liquid funds vs FD for companies: The practical difference for a CFO

Once the governance structure is in place, the actual comparison is straightforward. Fixed deposits offer a locked-in rate for a fixed tenure, with a penalty for early exit. Liquid funds hold short-duration debt instruments and can generally be redeemed within one working day, without a penalty, though returns aren't guaranteed the way an FD's rate is. For a CFO managing surplus funds, the FD's rigidity is often the more consequential factor than the return gap, since an FD locked against the wrong forecast creates a liquidity problem exactly when flexibility matters most.

Mutual fund investments are subject to market risk. Please read scheme-related documents carefully before investing. Past performance is not indicative of future returns.

Best investment for corporate surplus cash: matching instrument to mandate

There isn't a single best investment for corporate surplus cash across every business. The right answer depends on the mandate set for that specific pool of money, how much risk is acceptable, how quickly it might need to be accessed, and who's authorized to make the call. A CFO operating without this mandate defined in advance ends up making case-by-case decisions reactively, which is exactly the pattern that leads to inconsistent instrument choices and difficult-to-explain deviations if questioned later, by a board, an auditor, or an investor during diligence.

Short-term investment options for businesses: building tiers into policy

A well-structured surplus cash policy typically defines a few tiers, matched to time horizon, each with pre-approved instruments:

• Tier 1 (days to weeks): Liquid or overnight funds, prioritizing same-day to next-day access.

• Tier 2 (weeks to months): Money market funds or short-tenor FDs, where a bit more duration is acceptable.

• Tier 3 (months to a year or more): Corporate bond funds or longer-tenor FDs, for surplus the business is genuinely confident won't be needed soon.

Defining these tiers in advance removes the need to re-litigate instrument choice every time surplus builds up, which is precisely the kind of structure a well-governed treasury function should run on.

How CFOs should manage surplus cash: reporting and review cadence

Beyond picking instruments, a CFO needs a review cadence- how often the allocation gets checked against actual cash flow needs- and a reporting mechanism for how deployed surplus gets communicated to the board or leadership. Even a simple quarterly summary- how much is where, why, and what's changed since the last review- builds the kind of accountability that protects a CFO if a decision is ever questioned later. We've covered the broader strategic framework CFOs typically use for this here: How to multiply idle cash

What belongs in a written surplus cash policy

A genuinely useful policy is short, not exhaustive. It should state the minimum operating buffer, the approved instruments per tier, the delegation limits and who signs off at each level, and the required review frequency. This matters more as finance teams grow or roles change, since a documented policy means decisions don't depend on institutional memory that walks out the door with whoever originally made the call. We've covered how this fits into a fuller corporate cash management approach here: Corporate cash management explained

Getting the governance right first is really what makes the liquid-funds-versus-FD decision easy. Once the mandate, tiers, and reporting are defined, picking the instrument for any given pool of surplus becomes a formality, not a fresh debate every time.

FAQs

1. Where should companies invest surplus cash if there's no formal policy yet?

Start by defining a minimum operating buffer and a simple tiered structure by time horizon before selecting specific instruments. Instrument choice without a governing framework tends to be inconsistent and hard to explain later.

2. What's the best investment for corporate surplus cash overall?

There isn't one universal answer. The right instrument depends on the mandate for that specific pool of cash, its time horizon, and the business's risk tolerance, not a single "best" product.

3. How should CFOs manage surplus cash if delegation authority isn't clearly defined?

Establish delegation limits and a mandatory reporting loop back to leadership before delegating any investment decisions, similar to how public sector governance frameworks structure this.

4. Are liquid funds always better than FDs for corporate surplus?

Not always. FDs suit surplus with a genuinely fixed, known timeline where rate certainty matters more than flexibility. Liquid funds suit surplus where the exact timeline is less certain.

5. How often should a CFO review the split between liquid funds and FDs?

Quarterly works well for most businesses, with more frequent reviews during periods of significant cash flow change or shifting interest rate conditions.