Bitcoin DCA: how much to invest each week based on your salary
Quick answer: The widely accepted rule is to allocate 5-15% of your disposable income (after fixed costs and emergency fund) to Bitcoin via weekly or monthly DCA. For a €1,800 net salary with €1,200 in expenses, a reasonable DCA would be €30-90 per week.
"I want to DCA into Bitcoin but I don't know how much to buy each week. Too little feels pointless, too much and I'm scared I'll need that money."
DCA (Dollar Cost Averaging, or periodic buying) is the most consistent strategy to accumulate Bitcoin without trying to time the market. The logic is mathematical: buying the same euro amount every week or month means you buy more BTC when the price is low and less when it's high, averaging the unit cost down. Studies like Bitwise (2024) show a 5-year Bitcoin DCA would have beaten 90% of active investors.
But DCA only works if it's sustainable. The first question is not "how much do I want" but "how much can I maintain if Bitcoin drops 70% tomorrow". Statistically that happens 1-2 times per cycle. A DCA you have to interrupt at the worst moment (precisely when prices are lowest) destroys the entire mathematical edge of the strategy.
The operational rule that works best in practice is a fraction of your surplus after three things: (1) essential expenses covered, (2) emergency fund of at least 3 months of expenses in a savings account or deposit, and (3) pension plan or world-index (MSCI World or similar) receiving at least 60-70% of your monthly investment. Bitcoin is the last layer, not the first.
Step-by-step guide
- 1
Calculate your monthly surplus
Net income − fixed costs (rent, food, transport, insurance) − emergency-fund contribution − MSCI World or similar contribution = disposable surplus. Be honest: if nothing is left, Bitcoin DCA shouldn't start yet.
- 2
Apply the 5-15% rule
From the surplus, allocate to Bitcoin between 5% (conservative profile) and 15% (aggressive with a 5+ year horizon). Very few cases justify going above 15%; most people err by over-allocating, not under.
- 3
Prefer weekly frequency if possible
Weekly DCA reduces daily volatility impact more than monthly. In real numbers the statistical gap is small (~1-2% better average cost) but the weekly habit helps you not skip contributions when price drops.
- 4
Automate the buy
Bit2Me, Kraken, Relai and Swan let you set up automated recurring buys via SEPA or card. Automation is what turns intent into real accumulation. Without it, 40% of the time you "forget" or "wait for a better price" — both of which kill the strategy.
- 5
Withdraw to cold storage every 3-6 months
Once your exchange balance exceeds ~€1,000-2,000, move to a hardware wallet (Ledger, Trezor). Exchange counterparty risk is real and growing. Consider this withdrawal as part of the DCA, not an extra step.
- 6
Review every 6 months, not every week
The temptation to check your balance daily is the biggest enemy of DCA. Set a reminder every 6 months to review portfolio %, rebalance if you're above target, and bump the contribution if you got a raise. Outside that, ignore the price.
Key takeaways
- Weekly DCA ~10% better than monthly in 5-year backtests.
- 5-15% rule of surplus, never of gross income.
- Automation mandatory — without it, abandonment rate >40%.
- Cold storage every 3-6 months lowers counterparty risk.
- Review every 6 months, not every day — daily checking kills discipline.
- Never DCA without an emergency fund already covered.
Frequently asked questions
Does weekly or monthly DCA work better?
Weekly, by a small statistical margin (~1-2% better average cost in 5-year backtests). But the decisive factor is consistency: a monthly DCA you actually keep is better than a weekly DCA you abandon on drawdowns.
Should I pause DCA in a bear market?
No. The very point of DCA is to buy more Bitcoin when prices are low. Pausing destroys the cost-averaging edge. If you must reduce the amount for legitimate reasons, cut it but don't stop.
Can I DCA into multiple cryptos at once?
Yes, but beware fragmentation. A reasonable rule is 70-80% Bitcoin, 15-25% Ethereum, 5% rest. The more coins you track, the more likely you'll abandon DCA from over-management.
Which platforms support automated DCA in Europe?
The most used are Bit2Me (Spain, SEPA), Relai (Switzerland, Bitcoin-only), Kraken (recurring buys), Coinbase Advanced (recurring), and Swan (US, expanding to EU). Compare fees carefully: on €100 weekly, a 1% spread is €52 per year.
How much do I need to start?
Most exchanges support buys from €10-25 per operation. Starting matters more than starting big. A €20/week DCA for 4 years, at an average buy price close to the current cycle, can exceed €5,000 invested with material upside.
Simulate your DCA with the CryptoOráculo calculator: enter weekly amount, start date and horizon, and see how much Bitcoin you would have accumulated and the resulting average unit cost.
Simulate your DCA with the calculator