Summer is the most expensive season for the average American family — and the least budgeted for. Vacation, camps, activities, and back-to-school costs arrive simultaneously, creating a predictable financial disruption that a sinking fund strategy eliminates.
The average summer cost spike (families with children)
| Category | Average summer cost |
|---|---|
| Family vacation | $3,500–$8,000 |
| Summer camp / activities | $800–$3,000/child |
| Back-to-school shopping | $700–$1,500/child |
| Increased food / entertainment | $200–$500/month extra |
| Summer childcare gap | $500–$2,000 |
The sinking fund strategy
Divide total summer costs by 12 and save that monthly amount in a dedicated HYSA sub-account starting January 1.
Example: $6,000 in summer costs ÷ 12 = $500/month saved Jan–June = $3,000 by June 1 + earn 4% on savings while building.
The back-to-school budget specifically
- Buy school supplies in August (week of peak sales, not September)
- Clothing: buy one size up at end-of-summer clearance for the following year
- Technology: laptops and tablets are cheapest in August (back-to-school deals) and January (post-holiday)
- Register early for extracurriculars — early registration discounts average 10–20%
Some families implement a "no non-essentials" rule for June 15 – August 31 outside the planned summer budget. The rationale: summer entertainment pressure is constant, and without a hard boundary, discretionary spending expands to fill summer weeks. A planned summer budget + freeze on impulse spending is the winning combination.
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About the author
Enrique 'Kike' Faúndez is an Information Systems and Management Control Engineer from Universidad de Chile, with master’s degrees in Finance from Universidad de Chile and Industrial Engineering from Pontificia Universidad Católica de Chile. He has 15+ years of experience in regulated financial services across finance, operations, and digital product development. He founded CashControlly in Santiago, Chile, with the conviction that personal financial control should not be a privilege, but an accessible and well-designed tool.
- Master's in Finance, Universidad de Chile
- Master's in Industrial Engineering, Pontificia Universidad Católica de Chile
- Information Systems and Management Control Engineer, Universidad de Chile
- AI and ITIL certifications
- 15+ years in regulated financial services
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