Surplus cash investment for companies: Options, rules and strategy (2026)

Surplus cash is the easiest money in a company to mismanage, because nothing forces a decision. Left alone, it sits in a current account, losing value to inflation while the business may be paying for credit elsewhere. Good surplus cash management starts with placing surplus deliberately: a clear horizon, a clear instrument and a clear approver.

This is the overview. It covers what counts as surplus, where companies can invest it in India, the rules that apply, and an allocation framework. With the RBI having raised the repo rate to 5.50% on October 7, short-term yields are moving, so check current figures before committing.

What is surplus cash, and how is it different from idle cash?

Surplus cash is money beyond what the business needs for operations and its reserve buffer. Idle cash is the part of that surplus doing nothing, sitting in a current account earning close to zero. All idle cash is surplus, but surplus that’s already invested isn’t idle. Surplus cash investment aims to move surplus from idle to working.

How much should you keep as a buffer?

Fix the buffer before investing anything. Most businesses hold three to six months of operating expenses, towards the higher end if revenue is lumpy or seasonal. Only cash above that line is investable. Skip this step, and you end up investing money you need, then redeeming at the wrong time.

Where should a company invest surplus cash?

Six options cover most needs. Under SEBI’s categorisation, maintained by AMFI, liquid funds hold securities maturing within 91 days and money market funds up to one year, while overnight funds hold one-day securities.

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

For the full side-by-side comparison, including how to choose between them, see: Best low-risk options to invest idle cash in 2026

What is the safest way to invest surplus cash?

No option is risk-free, but the risks differ in kind. Treasury bills carry sovereign backing. Bank FDs carry bank credit risk, with deposit insurance limited to ₹5 lakh per depositor per bank. Liquid and overnight funds invest in short-duration, high-quality debt, and SEBI requires liquid funds to hold at least 20% of assets in liquid instruments such as cash and government securities. Every fund carries a SEBI risk-o-meter label, so check it first. Low risk is not zero risk, and unlike an FD, fund returns aren’t guaranteed.

The rules companies need to know

• Onboarding: Investing as a company needs corporate KYC: entity documents, a board resolution, and authorised signatory details.

• Internal approvals: Put approval thresholds by role in a written treasury policy so deployment doesn’t stall.

• Redemption: Funds typically redeem in about one working day. Instant access is capped at the lower of ₹50,000 or 90% of folio value, so plan larger needs a day ahead.

• Tax:. Gains from liquid, overnight and money market funds are taxed at the company’s applicable corporate rate, regardless of the holding period. Arbitrage funds follow equity rates: 20% short-term, 12.5% long-term. Resident investors face no TDS on redemption, though dividend payouts above ₹10,000 per fund house attract 10% TDS.

Tax rules change, and the Income-tax Act, 2025 applies from April 1, 2026, so confirm current treatment with a tax advisor.

A simple allocation framework

Split surplus by when it might be needed, not by which instrument sounds best.

The split above is illustrative, not a recommendation. Set yours from your own forecast, and review it quarterly or whenever the forecast changes.

Putting it into practice

The common failure isn’t picking the wrong fund. It’s deploying once and never revisiting, or never deploying at all. A written policy, a forecast, and a regular review turn surplus cash investment into routine. 

We’ve covered the broader strategy that ties these together here: Corporate cash management explained: strategies every finance team should know. Done consistently, that routine is what keeps surplus working instead of waiting.

FAQs

1. What is surplus cash in a company?

Money beyond what operations and the reserve buffer require, with no immediate claim on it. Surplus builds unnoticed between reviews, so KodoNorth’s AI agent sends proactive alerts for surplus cash and upcoming payables.

2. Where should a company invest surplus cash?

Match the horizon: overnight or liquid funds for days to weeks, money market funds or T-bills for months, and arbitrage or corporate bond funds for a year or more.

3. How do you invest surplus cash in a business?

Fix your buffer, complete corporate KYC, pick instruments by horizon, and get approvals. KodoNorth gives access to 20+ AMCs on one platform, supports approval workflows set to your policy, and syncs transactions to your ERP.

4. What is the safest way to invest surplus cash?

Treasury bills have sovereign backing, and overnight funds sit lowest among debt funds. Nothing is entirely risk-free.

5. Can a company invest surplus cash in liquid funds?

Yes. Many companies park surplus in short-term FDs earning roughly 3-5%, while liquid mutual funds have delivered 6%+, with redemption typically in about a working day.

6. Is it safe to invest company surplus cash in mutual funds?

Liquid and overnight funds are low risk and SEBI-regulated, but not risk-free, and returns aren’t guaranteed. Check the risk-o-meter and match the fund to your horizon.