Stock Taxes and Record Keeping: What Investors Need to Track

Most countries tax stock investors on two things: dividends, taxed as income, and capital gains, the profit when you sell shares for more than you paid. Which rules apply depends mainly on where you live, not on where the stock is listed. For a non-US investor in US stocks, the US usually takes tax from dividends at source, while gains are mostly a matter for the home country. Rates and rules change, often every budget, so keep complete records and check the current rules with your tax authority or a qualified adviser.

The two taxable events

1. Dividends: usually taxed in the year you receive them, whether or not you reinvest them.
2. Capital gains: usually taxed only when you sell (a realised gain). A rise in value you have not sold is unrealised and in most countries is not taxed yet. Realised losses can often reduce taxable gains, subject to local rules.

Cost basis: what you really paid

Your cost basis is the purchase price plus buying costs; your proceeds are the sale price minus selling costs.

Several purchases of the same stock

If you bought the same stock at different times (different lots), which shares you are treated as selling changes the gain.

Holding periods

Some countries tax short-term and long-term gains differently. In the US, for example, gains on assets held for more than a year are taxed at lower long-term rates for US taxpayers. Pakistan's tax on gains from securities has also depended on the holding period and has changed in several budgets. Check the rules for the year you sell, not the year you buy.

US taxes for non-US investors

• Dividends: the default US withholding is 30%, reduced if a tax treaty applies and you have filed a valid W-8BEN (see how to buy US stocks). Your home country may then tax the dividend too, sometimes allowing a credit for the US tax already withheld. Whether you get a credit, and how much, depends on your country's rules.
• Capital gains: generally not taxed by the US for non-resident individuals, with exceptions (for example, people who spend long periods in the US). Your home country may tax them.
• Annual statement: US brokers usually issue non-US clients a Form 1042-S, showing US-source income such as dividends and the tax withheld. Keep it.
• Estate tax: US shares can be subject to US estate tax for non-residents above a fairly low threshold, unless a treaty changes this. Larger investors should get advice.

Currency: your gain in your own money

Your home tax authority usually wants figures in your home currency, so exchange rates become part of the gain.

Rules that catch frequent traders

• Wash sales (US taxpayers): a loss is disallowed for now if you buy the same or a substantially identical security within 30 days before or after selling at a loss.
• Other countries have similar rules, such as the UK's 30-day "bed and breakfast" rule. Selling for a tax loss and buying straight back may not work where you live.
• In some countries, very frequent trading can be treated as a business, with different tax treatment.

What records to keep

Record	Why you need it
Trade confirmations: date, ticker, quantity, price, fees	Cost basis and proceeds for every lot
Monthly and annual broker statements	Proof of holdings, dividends and fees
Dividend records and tax withheld (Form 1042-S for US brokers)	Income and foreign tax credits
Exchange rates used for every trade and dividend	Converting to your home currency
Bank transfer receipts in and out	Showing the source of funds and money brought home
Your W-8BEN and account opening documents	Proof of status and treaty claims

Download statements regularly: brokers sometimes limit how far back you can download them, and accounts can be closed. Many tax authorities can review several past years, so keep records for at least as long as your country's rules require.

How tax shapes your strategy

1. Turnover costs tax as well as fees. High-turnover strategies can lose much of their edge to tax in countries that tax short-term gains heavily.
2. After-tax backtests. For your own planning, estimate tax on top of trading costs (see backtesting stock strategies).
3. Dividends versus buybacks. For investors who lose part of each US dividend to withholding, companies that return cash through buybacks can be more tax-efficient (see dividends and buybacks).

Next, the Pro section begins with the trader's biggest enemy: trading psychology and journaling.