Before you place an SLBM lending order, you want to know: how much will I actually earn from this? The calculation is straightforward once you know the formula, and you can run it yourself before lending a single share.
This post gives you the exact formula, walks through worked examples at different portfolio sizes, and shows what the after-tax income looks like at the 20 and 30 percent tax slabs.
Key Takeaways
- SLBM income is calculated as: (Holdings Value) multiplied by (Annualised Fee Rate) multiplied by (Lending Period in Days) divided by 365.
- The annualised fee rate is the key variable. It changes every month based on live supply and demand. Check the NSE SLBM order book before lending to confirm the current rate for your specific stock.
- After broker processing fees (typically a few rupees per share per contract) and income tax at your applicable slab rate, the net income is what you actually keep.
- SLBM income is business income, taxed at your applicable income tax slab rate. Use 20 or 30 percent for most retail investors when estimating net income.
- A quick check: is the annualised lending fee high enough to justify the administrative effort for your specific holding size? At Rs. 5 lakh and 1 percent, gross income is Rs. 5,000 per year.
The Basic Formula
SLBM lending income is calculated on an annualised basis:
SLBM Gross Income = Holdings Value x Annualised Fee Rate x (Lending Period in Days / 365)
Where: Holdings Value = Number of shares x Current market price per share. Annualised Fee Rate = the rate shown on the NSE SLBM platform for that stock, expressed as a decimal (e.g. 2 percent = 0.02). Lending Period = number of calendar days from the lending start date to the contract expiry date.
Most SLBM contracts are monthly, typically running 30 to 31 days. For simplicity, many investors use 30 days for a monthly calculation. The formula then becomes:
Monthly Gross Income = Holdings Value x Annualised Fee Rate x (30 / 365)
Worked Examples
Example 1: Standard Nifty 50 holding
Stock: Large cap Nifty 50 blue chip. Number of shares: 500. Current market price: Rs. 1,000. Holdings value: Rs. 5,00,000. Annualised lending fee: 1.5 percent.
| Period | Gross Income Calculation | Gross Income |
| Monthly (30 days) | Rs. 5,00,000 x 0.015 x (30/365) | Rs. 616 |
| Quarterly (3 months, 91 days) | Rs. 5,00,000 x 0.015 x (91/365) | Rs. 1,872 |
| Annual (12 months, 365 days) | Rs. 5,00,000 x 0.015 | Rs. 7,500 |
Example 2: Larger HNI holding
Holdings value: Rs. 25,00,000. Annualised fee: 2 percent.
| Period | Gross Income |
| Monthly | Rs. 4,110 |
| Quarterly | Rs. 12,500 |
| Annual | Rs. 50,000 |
Example 3: High-demand stock
Holdings value: Rs. 10,00,000. Annualised fee: 6 percent (high short interest stock).
| Period | Gross Income |
| Monthly | Rs. 4,932 |
| Quarterly | Rs. 14,959 |
| Annual | Rs. 60,000 |
Deducting Broker Processing Fees
Your broker charges a processing fee on SLBM transactions, deducted from the gross lending fee before you receive the credit. Processing fees vary by broker but are typically small: a few rupees per share per contract, or a small percentage of the gross fee.
Confirm the exact processing fee structure with your broker before placing a lending order. For estimation purposes, assume a processing fee of 0.1 to 0.3 percent of gross lending fee if your broker charges a percentage, or calculate the per-share fee if it is a flat rate.
Net of processing fees, the formula becomes:
Net Before Tax = Gross Income x (1 minus Processing Fee Percentage)
After-Tax Income Calculation
SLBM lending fee income is taxed as business income at your applicable income tax slab rate. Here is what Example 1 (Rs. 5 lakh holding at 1.5 percent) looks like after tax:
| Scenario | Annual Gross | Tax Rate | Tax Payable | Net Annual Income |
| 20% tax slab (income Rs. 5 to 10 lakh) | Rs. 7,500 | 20% | Rs. 1,500 | Rs. 6,000 |
| 30% tax slab (income above Rs. 10 lakh) | Rs. 7,500 | 30% | Rs. 2,250 | Rs. 5,250 |
| 30% slab with 10% surcharge (income above Rs. 50 lakh) | Rs. 7,500 | 33% | Rs. 2,475 | Rs. 5,025 |
These calculations show only the tax on the SLBM fee. Health and education cess at 4 percent applies on the income tax amount (excluded here for simplicity). Your total income tax liability is computed on your full income including SLBM fees, salary, capital gains, and other sources.
The Quick Check: Is It Worth It for Your Holding?
Before setting up SLBM for a specific stock, run this quick check:
- Check the NSE SLB market data page for the current annualised fee on that stock.
- Multiply the fee rate by your holding value to get the annual gross income estimate.
- Subtract estimated broker processing fees (confirm with your broker).
- Apply your income tax slab rate to get the after-tax net income.
- Decide: is this net income worth the monthly administrative time of monitoring, re-lending after each expiry, and the occasional complication of corporate actions or voting right suspension?
As a general benchmark: for most investors, SLBM becomes practically worthwhile at Rs. 10 lakh or more in eligible holdings. At Rs. 5 lakh and 1 percent, the annual gross of Rs. 5,000 is real income, but the administrative effort may not be the best use of your time unless you are already monitoring your portfolio closely.
At Rs. 50 lakh and 1.5 percent, the annual gross of Rs. 75,000 (net of tax at 30 percent: Rs. 52,500) is meaningful and worth the effort.
Fortune Wealth helps investors in Mumbai manage long-term equity portfolios. For guidance on income strategies for existing stock holdings, connect with our team.
Frequently Asked Questions
What is the formula for calculating SLBM income?
SLBM Gross Income = Holdings Value multiplied by Annualised Fee Rate multiplied by (Lending Period in Days divided by 365). For a monthly contract (30 days): Holdings Value x Fee Rate x (30/365). The annualised fee rate is the rate shown on the NSE SLBM platform for your specific stock at the time of the lending order. After subtracting broker processing fees and income tax at your applicable slab rate, you get the net after-tax lending income.
Where do I find the current SLBM lending fee for my stocks?
Check the NSE SLB Market Data page at nseindia.com. Navigate to Market Data and then Securities Lending and Borrowing. The live order book shows available lending rates for eligible stocks. The rate displayed is the current market fee; it changes based on live supply and demand. Third-party platforms like StockeZee also aggregate NSE SLBM data. Always check the live rate immediately before placing a lending order, not from a blog post or a month-old screen capture.
Are SLBM income calculations different for short-tenure contracts?
The formula is the same regardless of tenure: Holdings Value x Fee Rate x (Days/365). For a 3-month contract (91 days): Holdings Value x 0.015 x (91/365). The annualised fee rate is always quoted as an annual rate regardless of the contract tenure, so you always divide by 365 and multiply by the actual days. For longer tenures, the gross income is proportionally higher, but you are also locked in for longer and cannot benefit from any fee spikes on other stocks during that period.
How do broker processing fees affect my SLBM income calculation?
Broker processing fees reduce your net lending income below the gross calculation. Processing fees vary by broker. Some charge a flat fee per share per contract (e.g. Rs. 2 per share per month). Others charge a percentage of the gross fee received. Confirm the exact fee structure with your broker before placing lending orders. When estimating net income, subtract processing fees from gross income before applying the income tax calculation. Net of fees and tax = Gross – Processing Fees – Income Tax on (Gross – Processing Fees).
How much after-tax SLBM income can I earn from Rs. 10 lakh in Nifty 50 shares?
At a 1.5 percent annualised lending fee (mid-range for most Nifty 50 stocks), a Rs. 10 lakh holding earns approximately Rs. 15,000 gross per year. After income tax at the 30 percent slab, the net is approximately Rs. 10,500 per year or approximately Rs. 875 per month. At a 2 percent fee, gross is Rs. 20,000 and net at 30 percent is Rs. 14,000 per year. These are illustrative estimates. Actual income depends on the specific stocks, the fee rate achieved when the lending order executes each month, and broker processing fees.
Does the SLBM income formula change if I lend for different tenures each month?
No. The formula is the same regardless of tenure: Holdings Value x Annualised Fee Rate x (Days/365). If you lend for one month in January (31 days), two months in March (61 days), and three months in June (91 days), calculate each contract separately using its specific days. The annual total is the sum of income from each individual contract. If your fee rate changes between contracts (as it will because SLBM rates reset each month), use the specific rate locked in for each contract, not an assumed constant.
| Topic | URL and Anchor Text |
| SLBM Earnings Breakdown | how much can you earn from SLBM in India |
| SLBM Tax Treatment | SLBM tax treatment in India for lenders |
| Stocks and Equity | explore equity investment in Mumbai |
