Capital put in is the denominator
Return is (current value minus all cash invested) divided by all cash invested. This simple measure treats the original purchase and later additions as one capital total, so it shows gain on money contributed rather than a yearly growth rate.
A gain on fifteen thousand dollars
Putting in $10,000 and later adding $5,000 creates a $15,000 cost basis in this example. A current value of $19,500 is therefore a $4,500 gain; $4,500 divided by $15,000 is a 30.00% return.
Contribution dates change the story
The calculation assumes every added dollar deserves the same treatment as the first dollar. That can be reasonable for a quick account review, but it ignores whether the extra $5,000 arrived yesterday or five years ago.
Separate deposits from internal transfers
Include cash dividends only if they were retained as part of the investment result, and deduct trading costs if the value shown does not already reflect them. Deposits, withdrawals, and transfers should come from statements rather than memory.
A total return is not an annual rate
This result is useful for checking the total change in one holding or account. It does not compare investments held for different lengths of time; annualizing a start and finish is the job of the CAGR calculation.
Where a one-period percentage stops
A positive percentage is not a forecast and says nothing about risk, tax, or purchasing power. When several dated contributions matter, use a cash-flow return method instead of treating this one-period view as an investment performance report.
Record the valuation date
A useful review writes down the account value date beside every contribution. If $5,000 was transferred from another account, record whether it is new capital or merely a move between accounts; treating an internal transfer as a contribution creates a false loss. Compare the calculated cost basis with the broker's transaction history before using it in a tax or performance discussion.
Do not let one fund hide another
If the account contains several funds, calculate each holding separately before blending them. A large gain in one asset can hide a loss in another, while a combined percentage is still valid only for the combined cash total. This separation also makes a later rebalance or sale easier to explain.
A dated cash-flow record changes the measure
Suppose the $10,000 opening amount was invested on January 1, the $5,000 addition arrived on December 31, and the account was valued at $19,500 the next day. The displayed 30.00% is still a valid gain-on-contributions ratio, but it gives the late deposit almost a full year of credit. A money-weighted return instead attaches a date to each cash flow and solves for the rate that makes their present values equal the ending value. That is the better performance question when deposits or withdrawals are material.
Losses and withdrawals need their own signs
If a holding worth $15,000 paid out $1,200 in cash and was later worth $14,400, the economic result is not simply a $600 loss. The distribution may belong in the ending proceeds if it was taken rather than reinvested. Conversely, a withdrawal used to pay a bill is not an investment loss. List external deposits as money in and external withdrawals or cash distributions as money out, then keep transfers between accounts out of both columns.
A percentage cannot be added across accounts
A 30% gain on a $15,000 contribution and a 10% loss on a $2,000 contribution do not average to 10%. The combined gain is $4,500 minus $200, or $4,300, divided by the combined $17,000 contributed: 25.29%. Dollar weighting is already built into the numerator and denominator. That makes a reconciled account total more useful than averaging the percentages shown in several brokerage screens.
Use the answer as a reconciliation checkpoint
The practical next step is to compare the $15,000 entered cost with transaction confirmations, cash dividends, and the valuation timestamp. If the statement reports a different basis, identify whether the gap is a fee, a transfer, a distribution, or an omitted lot before changing the return. This calculation is educational arithmetic, not a tax-basis determination, and it cannot establish the gain reported on a tax form.
Valuation is a snapshot, not a sale
An account valued at $19,500 may contain a quote from a market close, accrued cash, or an unsettled trade. A sale can produce a different amount after spread, commission, and tax. State whether the value is a statement balance or an executable proceeds estimate; mixing those values makes a return comparison drift even when every subtraction is correct.
One account can contain several return stories
A broadly diversified account may be reviewed as one cash-flow pool, while a concentrated holding is better examined lot by lot. The level chosen changes the question. A combined result can reconcile the account; it cannot reveal which holding created the gain or whether a new contribution masked a loss elsewhere.
Check the numerator as well as the rate
A return can be positive because the account value rose, because cash was distributed, or because a contribution was omitted from the denominator. Before comparing periods, reconcile beginning value plus deposits minus withdrawals plus change in value to the ending statement. That short ledger catches more errors than adding decimal places to the percentage. Keep the contribution dates with the percentage so later reviews do not confuse a cash-flow change with an investment result. Mark whether dividends were paid out or retained, because that choice changes the proceeds being compared.