KoreHow to split your investments into several portfolios without losing the total (and measure each one's return)
To split your investments into several portfolios without losing the total, you need three things: every transaction lives in exactly one portfolio, the total is the exact sum of the parts, and cash is counted once. Each part's return then comes from its own money movements: what you bought in that portfolio is money that went in, and what you sold or collected is money that came out.
Where the total breaks
Splitting positions is the easy part; cash is the hard one. If each portfolio keeps its own cash, a purchase you move to another portfolio looks as if it were paid with new money, while the cash you actually spent reappears in the portfolio it came from. The total goes up without you earning anything: in the example below, 5,080 that don't exist.
Three rules prevent it:
- Each transaction, whole, in one portfolio. A purchase is never split in two.
- Positions belong to each portfolio, with their own quantity, average cost and realized gain. The total is the sum.
- Cash is a single pool that lives in the main portfolio. Sales, dividends and interest from any portfolio go there.
An example: Main and Long term
Example values, in dollars. At first everything sits in one portfolio, Main:
| Date | Transaction | Amount |
|---|---|---|
| 2025-01-02 | Cash deposit | 10,000 |
| 2025-01-15 | Buy 10 AAPL at 200 | 2,000 |
| 2025-02-03 | Buy 8 VOO at 500 | 4,000 |
| 2025-07-01 | Buy 2 VOO at 540 | 1,080 |
| 2025-09-15 | VOO dividend | 20 |
On 2025-12-31, AAPL trades at 250 and VOO at 600. Cash is what's left of the deposit: 10,000 − 2,000 − 4,000 − 1,080 + 20 = 2,940.
Now you create a portfolio called Long term and move every VOO transaction into it: both purchases and the dividend.
| On 2025-12-31 | Before (all in Main) | After: Main | After: Long term | After: All |
|---|---|---|---|---|
| AAPL (10 × 250) | 2,500 | 2,500 | 0 | 2,500 |
| VOO (10 × 600) | 6,000 | 0 | 6,000 | 6,000 |
| Cash | 2,940 | 2,940 | 0 | 2,940 |
| Total | 11,440 | 5,440 | 6,000 | 11,440 |
The All view, the sum of everything, doesn't move: 11,440 before and after. VOO keeps its average cost of 508, which is (4,000 + 1,080) ÷ 10, because its transactions moved together, and the cash stays whole in Main.
If Long term had its own cash, its 5,080 of purchases would look like new money and Main would be back to 8,000 in cash (10,000 − 2,000). The total would become 16,520, with 5,080 made up.
How to calculate the return of a single portfolio
A portfolio with no cash of its own is measured as a slice of your money. Each purchase is money going into it; each sale, dividend or interest payment is money leaving it for the shared cash; and at the end comes what its positions are worth today. From those movements you get the XIRR, the annual rate that makes everything add up (step by step here).
In a spreadsheet, put the dates in column A and the movements in column B: money going into the portfolio as negative, money coming out as positive, with today's value in the last row.
| A: Date | B: Long term movement |
|---|---|
| 2025-02-03 | −4,000 |
| 2025-07-01 | −1,080 |
| 2025-09-15 | +20 |
| 2025-12-31 | +6,000 |
- Google Sheets or Excel in English:
=XIRR(B2:B5, A2:A5) - Excel in Spanish:
=TIR.NO.PER(B2:B5; A2:A5)
Result: 22.93% a year, rounded to two decimals. The dividend counts for Long term even though the money landed in Main's cash.
The same method for the other two views:
| View | Movements | XIRR |
|---|---|---|
| Long term | −4,000, −1,080, +20 and +6,000 | 22.93% |
| Main | −2,000 on 2025-01-15 and +2,500 on 2025-12-31 | 26.20% |
| All | −10,000 on 2025-01-02 and +11,440 on 2025-12-31 | 14.48% |
Main measures only its AAPL position; its cash stays out of the calculation. All, on the other hand, starts from the deposit and includes the 2,940 that sat uninvested all year. That's why it comes out below both parts: All is the return on all your money, and each portfolio is the return on the money you put into it. Averaging the portfolios' returns won't give you All's.
How Kore. does it
- The portfolio picker sits in the sidebar, under the app's name (on a phone, in the header). It shows All ("consolidated"), which adds them all up, and each portfolio by name.
- Main is the main portfolio: new transactions land there unless you pick another one, and the cash lives there. In the others, the Total Net Worth card reads "CASH LIVES IN MAIN".
- From "New portfolio" and "Manage" you create portfolios and change their name, color and icon; "Make main" picks the main one.
- When you add a transaction or import a file, the Portfolio field decides where it goes: it starts on the one you're viewing, or on Main if you're in All.
- To move, in your transaction history you pick one transaction or all the filtered ones; on the Dashboard or the Screener, "Move to portfolio" (right-click an asset) moves all of its transactions. Kore. won't move anything that would leave a position negative in the source or the target.
- With a portfolio selected, the XIRR next to Unrealized P&L uses the movements above, with one decimal: Long term would show
XIRR: +22.9%. The "My Portfolio" comparison against an index follows the selected portfolio too. - The free plan has one portfolio, Main; Pro, up to 10. On the free plan, "New portfolio" carries a PRO tag.
The demo has two portfolios with sample data, Main and Long Term (the one with the Bitcoin icon): you can switch between All, Main and Long Term and see how the total is split, but you can't create others. Try it in the demo, no account needed.
Frequently asked questions
Can I hold the same asset in two portfolios?
Yes. Each portfolio keeps its own quantity and its own average cost, as if they were lots at two brokers, and All adds them up with a weighted average cost. If you split an asset's transactions between two portfolios, each part's average cost and realized gain are calculated separately and can differ from having everything together. The total value and the cash don't change.
Can I sell from one portfolio something that sits in another?
No. A sale has to be covered by what that same portfolio holds on that date. Pick the right portfolio in the Portfolio field, or move the purchases first.
Why does a portfolio show zero cash?
Because there's a single pool of cash, shown in the main portfolio. Whatever you sell or collect in any portfolio adds to it. If you'd rather see it in another one, make that one main with "Make main".
Do I need the Pro plan?
To have more than one portfolio, yes: the free plan has one and Pro, up to 10. With a single portfolio, All and Main show exactly the same thing.