If you've worked at more than one company, or you're comparing offers from an Indian startup and a US-listed company, you've probably seen all three of these terms on an offer letter: RSUs, ESOPs, and ESPPs. They all involve company shares. That's about where the similarity ends.
Short answer: RSUs are shares your employer promises you for free, ESOPs are the right to buy shares at a fixed price, and ESPPs let you buy shares at a discount through payroll deductions. Each one is taxed at a different point in its lifecycle, and mixing them up is the fastest way to misjudge how much of your "equity comp" you actually get to keep.
This post covers the grant, vesting or exercise, and sale mechanics of each instrument, the tax trigger differences between them, and the DPIIT-eligible-startup deferral that applies specifically to ESOPs.
RSUs: restricted stock units
RSUs are a form of equity compensation that employers grant to employees. Instead of receiving shares immediately, you're promised company shares that will be delivered once certain conditions, usually continued employment over a specified period, are met.
How RSUs move through their lifecycle
- Grant: your employer promises to award you a certain number of RSUs. You don't own the shares yet, and they haven't been transferred to you. The grant itself is not a taxable event, and you don't need to report anything in your tax return simply because RSUs were granted.
- Vesting: the RSUs convert into company shares and become yours. This is the first taxable event for RSUs. The fair market value (FMV) of the shares on the vesting date is treated as employment income and taxed like salary, and you owe this tax even if you don't sell the shares.
- Sale: you sell the shares, which may result in a capital gain or loss.
Your employer typically deducts TDS underSection 192 of the Income-tax Act when RSUs vest, before you receive the shares, most commonly through sell-to-cover, where enough shares are sold to cover the estimated tax.
Once you sell, capital gains tax applies only on the change in value after the vesting date, since the vesting-date FMV was already taxed as salary. Foreign shares, including RSUs of overseas companies, are treated as unlisted equity shares for Indian tax purposes. Shares held up to 24 months from the vest date are short-term capital gains (STCG), taxed at your income slab rate; held more than 24 months, they're long-term capital gains (LTCG), taxed at 12.5% without indexation.
If you leave your employer before RSUs vest, the unvested units are forfeited in most cases, and since the shares never became yours, you owe no tax on them.
If you want the full mechanics, including how the tax trigger is calculated step by step and how to read it off your Form 16, see ourRSU taxation guide.
ESOPs: employee stock options
An ESOP grants you an option: the right to buy company shares at a fixed exercise price, set at grant, regardless of how much the shares are worth later. Unlike an RSU, which hands you shares outright at vesting, an ESOP requires you to actively exercise the option and pay the exercise price before you own anything.
How ESOPs move through their lifecycle
Based on theIncome Tax Department's own summary of ESOP taxation, the lifecycle runs as follows:
- Grant: no immediate tax. The grant-date fair market value is irrelevant for tax purposes.
- Exercise: this is the taxable event, not vesting. When you exercise (pay the exercise price and convert the option into an actual share), the perquisite value, the difference between the FMV on the exercise date and the amount you paid, is taxed as salary income underSection 17(2)(vi). For listed shares, FMV is the average of the opening and closing price on the exercise date; for unlisted shares, it's a merchant banker's valuation done on or within 180 days before exercise.
- Sale: capital gains tax applies on any further change in value. The holding period starts from the allotment date, and the exercise-date FMV becomes your cost basis.
This is the single biggest structural difference between RSUs and ESOPs: RSUs are taxed at vesting, which happens automatically. ESOPs are taxed at exercise, which is a decision you make and often have to fund out of pocket, since you're paying the exercise price on shares that may still be illiquid (common with private startup ESOPs). This is also why ESOP holders can end up with a large tax bill on shares they can't yet sell, a problem RSU holders at listed companies rarely face because sell-to-cover handles it automatically.
The DPIIT-eligible-startup ESOP deferral
Recognising that this cash-flow problem is acute for early employees at private startups, the Income-tax Act allows a narrow class of companies, DPIIT-recognised "eligible startups" under Section 80-IAC, to defer the TDS on ESOP perquisites. Under Section 192(1C), the employer's TDS deduction is deferred to the earliest of:
1. the expiry of 48 months from the end of the relevant assessment year in which the shares were allotted, 2. the date the employee sells the shares, or 3. the date the employee ceases to be an employee of the company.
The tax rate applied when the deferred TDS finally falls due is the rate in force for the financial year in which the shares were allotted, not the year the deferral ends. (Source:TaxGuru, quoting Section 192(1C) bare-act text)
On sale, ESOP shares of an Indian private company are also unlisted securities, which puts them in the same 24-month LTCG bucket described for RSUs above, since that threshold applies to unlisted shares generally, not just foreign ones.
ESPPs: employee stock purchase plans
An Employee Stock Purchase Plan lets you buy shares of your employer's parent company at a discount to the market price. If you participate, you're buying real shares, funded by your own payroll deductions, not a grant of free shares like an RSU.
How ESPPs move through their lifecycle
- Enrollment and offering period: contributions are deducted from your post-tax salary each month over an offering period, typically six months.
- Purchase: at the end of the offering period, your accumulated contributions are used to buy shares. Many plans include a lookback provision, where the purchase price is the lower of the share price on the offering start date or the purchase date. If the stock falls during the offering period, you still get the market price on the purchase date, so the lookback only adds value when the stock price has risen.
- Sale: you sell the shares later, which may result in a capital gain or loss.
The discount you receive at purchase, FMV on the purchase date minus the price you actually paid, is treated as a perquisite underSection 17(2) and taxed as salary income in that financial year. This tax event happens at purchase, regardless of when you later sell the shares. Your accumulated contributions (the money already deducted from salary) are not taxed again; only the discount is.
On sale, your cost of acquisition for capital gains purposes is the same FMV used to calculate the perquisite, not the discounted price you actually paid, so the already-taxed discount isn't taxed a second time. The same 24-month rule applies: shares held up to 24 months from the purchase date are STCG, taxed at your slab rate; held longer, they're LTCG, taxed at 12.5% without indexation.
ESPP tax mechanics, including TDS, Schedule FA reporting, and LRS/TCS implications for funding contributions, get full treatment in ourESPP tax guide. We won't re-explain them in full here.
The vest-vs-exercise tax trigger, side by side
Example. Suppose you're comparing two offers: one from a US-listed company giving you RSUs, and one from an Indian DPIIT-recognised startup giving you ESOPs, both nominally worth the same grant value. Here's where the tax bill actually lands for each.
| | | | | | :-: | :-: | :-: | :-: | | \\Instrument\\ | \\Taxable event\\ | \\What's taxed\\ | \\Section cited\\ | | RSU | Vesting (automatic) | FMV on vest date, as salary | Section 192 (TDS), Section 17(2)(vi) (perquisite basis per KB) | | ESOP | Exercise (your decision) | FMV on exercise date minus exercise price paid, as salary | Section 17(2)(vi), Section 192(1C) for DPIIT-startup deferral | | ESPP | Purchase (automatic, end of offering period) | FMV on purchase date minus discounted price paid, as salary | Section 17(2) |
The result: RSUs and ESPPs both tax you automatically at a fixed point in the calendar (vest date, purchase date) with no action needed from you, and in most cases your employer withholds the tax for you. ESOPs are the outlier: you choose when to exercise, which means you choose when the tax bill arrives, and (outside the narrow DPIIT deferral) you may need to fund that tax bill in cash before the shares are liquid enough to sell.
