From 1 April 2026, SEBI requires that at least half of the margin you put up for any Futures & Options (F&O) position be backed by real cash or cash-equivalents — not by pledged shares. If you have been funding your entire derivatives margin with pledged stock, that no longer works. Here is exactly what the 50:50 cash-margin rule says, what counts as "cash", what it costs if you ignore it, and how to stay compliant.
What the 50:50 margin rule actually says
When you trade F&O, the exchange blocks a margin — money set aside to cover potential losses. You can provide that margin in two broad forms: cash and cash-equivalents, or non-cash collateral (shares, ETFs and other securities pledged to your broker). For years, active traders leaned heavily on pledged shares, because it let idle holdings double up as margin.
SEBI''s revised framework, effective 1 April 2026, caps that. A minimum of 50% of your total F&O margin must now sit in cash or cash-equivalents. The remaining 50% can still come from pledged securities. Pledged shares alone can no longer fund a derivatives position end to end.
What counts as "cash" vs "non-cash" collateral
This distinction is the whole game — and "cash-equivalent" is broader than literal cash:
| Counts as CASH / cash-equivalent | Counts as NON-CASH collateral |
|---|---|
| Cash balance with your broker | Equity shares (pledged) |
| Bank Fixed Deposits (lien-marked) | Most equity ETFs |
| Bank Guarantees | Mutual fund units (non-liquid) |
| Liquid & overnight funds / liquid ETFs | Other exchange-approved securities |
| Government securities & T-Bills (as specified) |
So you do not have to keep dead cash. A liquid fund, an overnight ETF or a lien-marked FD earns a return and qualifies on the cash side of the 50:50 split.
What changed on 1 April 2026
Earlier, brokers had room to let pledged securities cover the bulk of a trader''s margin. From 1 April 2026 the 50% cash floor is mandatory and monitored. If your cash component slips below half of the total margin you are using, you are in a cash shortfall — and that triggers charges. A subtle trap: if the pledged shares you posted fall in value, your non-cash side shrinks too, which can quietly push you under the 50% cash line even if you did nothing.
What it costs if you don''t maintain 50:50
There are two consequences:
- Interest on the shortfall. Brokers levy a delayed-payment / interest charge (commonly around 0.025%–0.05% per day, i.e. roughly 9–18% annualised, varying by broker) on the cash you are short.
- Per-order penalty. As reported, orders placed while the 50:50 ratio is breached can attract an additional ₹20 per order — but only where the cash shortfall exceeds ₹5 lakh. Smaller shortfalls escape the flat fee but still attract interest.
The penalties are deliberately modest per event; the friction is the point. SEBI wants to discourage traders from building large derivatives books on borrowed or pledged collateral with no real cash backing — a systemic-risk concern after years of rising retail F&O leverage.
A worked example
Say a position needs ₹10,00,000 of total margin.
- You must hold at least ₹5,00,000 as cash / cash-equivalents (cash balance, liquid fund, lien-marked FD, bank guarantee or G-Sec).
- The other ₹5,00,000 can be pledged shares.
If instead you hold ₹3,00,000 on the cash side and ₹7,00,000 in pledged stock, you are ₹2,00,000 short on cash. Because that shortfall is under ₹5 lakh, you would not pay the ₹20/order fee — but you would pay daily interest on the ₹2,00,000 gap until you top up the cash leg.
How to stay compliant
- Park a cash buffer in a liquid or overnight fund. It counts on the cash side and still earns roughly 6–7% — far better than idle cash.
- Lien-mark a bank FD with your broker; the deposit keeps earning interest while serving as cash-equivalent margin.
- Right-size your book. If half your margin must be cash, your real F&O capacity is anchored to how much cash you can deploy, not how much stock you can pledge.
- Watch the ratio intraday, especially after adding positions or when your pledged shares fall in value.
This sits alongside the wider leverage rules — see our explainers on the Margin Trading Facility (MTF) and on using a margin pledge to post shares as collateral. If you are choosing a broker for derivatives, our demat & broker comparison lists charges side by side.
Who this affects
Anyone trading equity, index or commodity derivatives who funds margin largely through pledged holdings — i.e. most active F&O traders. Cash-and-carry investors and pure intraday equity traders are not governed by this specific rule. If you already trade F&O with full cash margin, you comply by default.
Frequently Asked Questions
When did the 50:50 F&O margin rule take effect?
The revised SEBI margin framework requiring at least 50% cash / cash-equivalent collateral for F&O took effect on 1 April 2026. It applies across brokers and exchanges to derivatives margins.
Does a fixed deposit or liquid fund count as cash for the 50:50 rule?
Yes. "Cash-equivalent" includes lien-marked bank FDs, bank guarantees, liquid and overnight mutual funds/ETFs, and specified government securities — not just literal cash. You can satisfy the cash leg while still earning a return; only pledged equity shares and most equity ETFs fall on the non-cash side.
What happens if I don''t maintain the 50% cash margin?
Your broker charges interest on the cash shortfall (commonly around 0.025%–0.05% per day, varying by broker). Additionally, as reported, orders placed while the ratio is breached can attract a flat ₹20 per order where the cash shortfall exceeds ₹5 lakh. Persistent shortfalls can also lead to position restrictions.
Can I still pledge shares for F&O margin?
Yes — up to 50% of your total margin can come from pledged securities. What changed is that pledged shares can no longer fund the entire margin; at least half must be cash or cash-equivalents.
Does the 50:50 rule apply to intraday equity or delivery investing?
No. The rule targets F&O (derivatives) margin. Buying delivery shares for cash, or normal intraday equity trades, are not governed by this 50:50 cash-margin requirement, though other margin rules apply.
Sources: SEBI margin framework for derivatives (minimum 50% cash / cash-equivalent collateral), effective 1 April 2026; broker explainers from Zerodha, HDFC Securities and Kotak Securities on the 50:50 collateral rule. Interest rates, the exact penalty mechanics and the cash-equivalent list vary by broker and are updated by the exchanges — confirm current terms with your broker before trading. This is educational information, not investment advice. Current as of 2026.