Here's my practical guide to the concept of 'true expenses' — the YNAB idea that transformed how I handle irregular costs.

A true expense is any predictable cost that occurs less frequently than monthly. Car insurance: paid twice a year. Home maintenance: occurs unpredictably but averages about 1% of home value annually. Car replacement: needed every 7-10 years on average.

The mistake most people make: treating these as emergencies when they hit, disrupting the monthly budget and potentially going into debt for planned costs.

The fix: calculate the monthly equivalent and set aside that amount every month into a dedicated sinking fund.

Examples from my actual budget:

• Car insurance ($1,800/year): $150/month
• Home maintenance reserve ($3,600/year): $300/month
• Holiday gifts ($600/year): $50/month
• Annual subscriptions ($480/year): $40/month
• Dental (estimated $600/year): $50/month

Total 'true expense' set-asides: $590/month. When any of these costs hit, they're already funded. No budget disruption, no stress.