Compare the same horizon with the assumptions in view

Compare buying, renting and waiting with explicit cash inputs, an assumed sale value and ending loan balance. Save or export your private browser scenario.

Buying, renting and waiting can all suit a Costa del Sol property search, but they involve different cash movements and commitments. A comparison becomes misleading when it puts a purchase price beside one year’s rent, forgets an eventual loan balance or assumes a future sale value will solve the budget. This tool puts the assumptions on the page and compares the same user-chosen horizon.

It supplies arithmetic rather than a recommendation. No future growth, mortgage rate, rent increase or investment return is predicted. Use the scenario preparation sheet to record the source and limits of each input. The complete ownership workbook helps organise the purchase and running amounts before you compare the alternatives.

Choose the same horizon for all options

Enter a whole number of years between one and thirty. Each option covers that complete period. Waiting means using a specified housing arrangement during the horizon; it does not mean living free of charge or automatically buying partway through. If you expect to wait two years and then buy, prepare separate stages outside this simplified comparison rather than claiming the waiting column already includes them.

Think about practical uncertainty as well as time. The buying decision guide and long-term rental guide help frame the options. A numerical scenario cannot settle whether a home suits a changing household, whether the rental agreement supports the intended stay or whether relocation plans will remain the same.

Build the owner’s initial cash requirement

The initial calculation is purchase price plus purchase costs plus initial works and setup, less the initial loan advance. Use the buying cost planner for transaction assumptions. Transfer the price and transaction costs into separate fields here; do not paste the planner’s combined cash requirement into the purchase-price field. Keep work and setup free of costs already included elsewhere.

This simple model limits the initial advance to the entered purchase price. It does not model staged advances, refinancing or borrowing against other assets. If those arrangements matter, obtain a fuller cash schedule rather than changing labels to force them into the fields. An initial advance of zero requires zero monthly loan payment and zero end balance in this model, so that an accidental debt assumption cannot slip into the cash-purchase scenario.

Follow running payments over the horizon

Enter annual ownership expenditure excluding debt, then a separate monthly loan payment. The tool multiplies both across the horizon. Use the ownership cost calculator to check what is included in the annual amount. Maintenance and replacements relevant to this simplified comparison need to be reflected in your entered assumptions; the tool has no hidden allowance for them.

Amounts are held constant. A monthly payment is not calculated from an interest rate or loan term, and the final balance is not inferred from the payments. Obtain the relevant information and label it as an assumption where it concerns the future. The mortgage planning guide covers wider household questions that this cash comparison does not answer.

Keep the future home and debt assumptions separate

Enter an assumed sale value and the remaining loan at the chosen horizon. The tool displays their difference as assumed sale equity before selling costs. It then subtracts that equity from gross owner cash paid, which already includes your selling-cost allowance. This keeps the outstanding loan from disappearing when the home is assigned an end value and keeps selling costs from being deducted twice.

The adjusted figure is labelled owner cash paid less assumed sale equity. It is not an investment return, an affordability decision or a universal definition of ownership cost. It can be negative under some inputs; that alone does not demonstrate a profit because opportunity cost, timing, inflation and other excluded cash movements have not been modelled. Use the exit planning guide to question the proposed end position.

Enter the rental alternative consistently

The rental column adds non-returnable setup costs, monthly rent over the horizon and other annual housing costs. A refundable deposit is not a consumed setup cost in this calculation. Track the cash tied up and the applicable return arrangements separately. The tool does not decide whether a charge is lawful, recoverable or included in a proposed tenancy; ask for the actual terms and appropriate advice.

Review deposits and guarantees and compare a consistent scope of services. If utilities are in one option, make clear how they are treated in the others. An occasional holiday rental is not interchangeable with a long-term arrangement solely because both have a monthly-looking price. Keep availability, intended use and contractual conditions alongside the figures.

Give waiting a real housing arrangement

Enter the monthly housing amount, non-returnable setup and other annual housing costs you would incur while waiting. This could represent a different rental or an existing arrangement, but the amounts must describe your own scenario. Zero should be entered deliberately where it is the intended assumption. Missing information does not mean a free alternative.

No return is added to funds that remain unspent while renting or waiting. Nor does the tool forecast a later purchase price. Those omissions can materially affect a wider economic comparison. Use the projection review guide to identify them and discuss a fuller analysis if required. The displayed waiting column answers one limited question: the housing cash entered for the same horizon.

Check the fictional example by hand

The sample uses five years, a €300,000 purchase price, €30,000 purchase costs, €10,000 works and setup, and a €150,000 initial advance. Initial own cash is €190,000. Annual ownership of €5,000 plus monthly loan payments of €800 produces €73,000 over five years. Adding a €15,000 selling allowance gives gross owner cash paid of €278,000.

An assumed €300,000 sale value and €120,000 ending loan give €180,000 sale equity before selling costs. The adjusted owner figure is €98,000. Rent of €1,200 a month, €1,000 setup and €1,000 annual extras gives €78,000. Waiting housing of €900 a month, zero setup and €1,000 annual extras gives €59,000. Every amount is fictional, including the loan figures; no market quote, recommended option or future result is implied.

Use sensitivity changes without turning them into forecasts

Change one uncertain assumption at a time, update and retain the version. For example, lower the assumed sale value while keeping the rest fixed, then examine a different horizon as a separate scenario. Record what changed instead of picking the most attractive total from several unrelated versions. The chart shows gross cash only; the table separately displays the sale-equity adjustment so the two concepts are not confused.

Use selling costs and proceeds to review the exit allowance. A smaller cost input is useful only when its basis is credible. Do not omit an unresolved expense to make buying appear closer to renting, or add an unsupported price increase to make waiting look less appealing. The purpose is a reproducible discussion, not a preselected winner.

Save the assumptions with the result

Optional browser saving and JSON export retain this tool’s inputs. The data is processed locally and is not submitted to the website. Keep completed files private and remember that another person using the browser profile may access its saved copy. Printing produces a scenario summary; retain the source notes as well. Imported files are checked before replacing current entries, and incomplete scenarios are not treated as valid exports.

Prepared on 10 November 2026. The UK government’s Spain guidance provides background for independent advice. This tool excludes rental income, investment returns on retained funds, inflation, discounting and tax calculations; it makes no professional assessment of your transaction. Use the clear inputs and exclusions to improve the questions you take to the appropriate advisers.