CONTRIBUTIONS / HYPOTHETICAL SCENARIOS
See how new money could be split among investments you already chose, without selling any holdings. Enter today’s balances and the percentages you want to work toward.
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01 / SET YOUR ASSUMPTIONS
Start here: Name your group of investments, enter the cash you want to add, then list each holding and its current value. Results update as you complete the fields.
This is a hypothetical calculator, not an actual David Tom portfolio or a set of investment picks. Symbols are labels you supply; no security, price, suitability or trading eligibility is verified.
Fictional example — EXAMPLE_A, EXAMPLE_B and EXAMPLE_C are made-up labels, not investment picks.
02 / REVIEW THE ILLUSTRATION
Dated JSON record · contains your inputs
Read the “Proposed addition” column first. It shows how much of the new cash goes to each holding. “Projected balance” is today’s value plus that addition; it does not include future growth.
A download captures the current calculation and its rule version. Later changes create a new scenario; they do not rewrite an earlier file. This page does not restore downloaded records.
KEEP THE LIMITS WITH THE RESULT
New cash goes to holdings below their chosen share of the total. Holdings already above their target stay intact and may remain above target. Changing targets changes a later illustration; it never starts a recurring action or sale.
Equal weights do not establish diversification. Funds may overlap, and a sector basket can be concentrated. The tool does not assess your complete holdings, obligations, risk capacity or investment suitability.
Fees, taxes, share prices, minimums, settled cash, fractional-share support and broker restrictions can change what is possible. No brokerage account is connected, and no order or trade is created.
For each position, the calculator finds the positive difference between its target share of the combined holdings-plus-cash total and its existing balance. Cash is divided proportionally across those positive deficits. Positions with no positive deficit receive no cash.
Calculations use exact whole cents and rational target fractions. Each proposed addition is rounded down to cents; leftover cents go to the largest fractional remainders, with exact ties resolved by normalized symbol in ascending character order. This convention is not an investment preference. A rounded addition can exceed an exact fractional-cent deficit by less than one cent.
For example, with existing balances of $200, $0 and $0, equal targets and $100 in new cash, additions are $0, $50 and $50. The first holding is not sold to make the final balances equal.
This DTP proportional-deficit illustration does not reproduce or verify Fidelity’s allocation or order-execution behavior. Target-weight contributions and Smart Buys are different features, and dividend reinvestment is separate. Check the current Fidelity Basket FAQ and your broker’s actual terms before acting.
A label accepted by this calculator may not be an eligible or tradable security. The tool cannot determine whether a legal restriction applies or has ended. Flagged scenarios stay paused for separate review; no country or market name automatically causes a sale.
Use 1–50 distinct symbols, each 1–25 letters, digits or . _ : / -, beginning with a letter or digit. Symbols are normalized to uppercase. Each balance and cash input may be up to $1 trillion; the combined total may be up to $10 trillion. These are software bounds, not suggested portfolio sizes. Custom targets use 0–100% and must total exactly 100%.