Skipping extended warranties for electronics

Cost: There’s no upfront cost. The trade-off is that once the standard warranty expires, you’ll have to pay out-of-pocket for any repairs — though this scenario is relatively rare.
In plain terms: Extended warranties typically cost 10% to 50% of the item’s original price. Sellers of these warranties earn profit margins 10 to 20 times higher than those on regular goods, and this price gap is exactly what you’re paying extra for. For major components like washing machine motors and refrigerator compressors, national regulations mandate a 3-year warranty period. If you come across a very cheap extended warranty, calculate its cost divided by the average repair cost for that item: this ratio gives the minimum probability of a breakdown within those years needed for the warranty to be worth the expense.
Benefit: Extended warranties are usually priced at 10% to 50% of the original product cost. Industry estimates cited in research show average gross margins on these warranties range from 50% to 60%: for every 100 yuan in sales, sellers earn 50 to 60 yuan in profit, which is roughly 18 times the gross margin of standard consumer goods. In 2003, extended warranties accounted for just 3% to 4% of Best Buy’s total revenue, yet generated over 50% of its total profits (based on U.S. retail data from the 2000s). For warranties priced far below this benchmark, you can run the same calculation: warranty cost ÷ average repair cost = the minimum breakdown probability required to make the purchase worthwhile. You should only buy a warranty if you estimate the chance of a breakdown at least once during its term is higher than this calculated value. For example, if an extended warranty costs 25 yuan and the average repair cost for the item is 300 yuan, the probability of at least one breakdown during the warranty period must exceed roughly 8% for it to be a smart purchase. The 300 yuan figure here is just a hypothetical example, not an actual statistical value. Before doing this calculation, subtract the coverage period already guaranteed by national regulations: the statutory warranty period starts on the date of purchase, with a 1-year coverage period for the entire washing machine or refrigerator, and a 3-year coverage period for their major components. For washing machines, these major components include the motor, timer, control board, and capacitors; for refrigerators, they are the compressor and temperature control unit. Paying for an extended warranty during any period where it overlaps with the statutory warranty means you’re paying extra for coverage you’re already entitled to (national regulations, effective since 1995).
Evidence grade: B
Sources:Chen T, Kalra A, Sun B (2009). Why Do Consumers Buy Extended Service Contracts? Journal of Consumer Research 36(4):611-623. https://doi.org/10.1086/605298；国家经贸委等 (1995). 部分商品修理更换退货责任规定（国经贸〔1995〕458 号，第八条三包有效期自开具发票之日起计算；附件《实施三包的部分商品目录（第一批）》洗衣机、家用电冰箱整机 1 年、主要部件 3 年）. 国家市场监督管理总局行政规范性文件. https://www.samr.gov.cn/zw/zfxxgk/zc/xzgfxwj/art/2019/art_f943e66de125437d92df701e1654c47c.html
Notes: The gross margin figure cited above is an industry estimate referenced in a research paper from Business Week in 2004, not a value measured directly by the paper’s authors. The calculation method described works for ordinary consumers who can afford to pay for a single repair out of pocket. People who rely on a single device for their livelihood and have no backup device should perform a separate calculation. Separate calculations are also needed for product-specific add-ons like phone screen protection plans: first estimate how often you expect to drop your device, then assess whether the premium is justified. Even very cheap extended warranties won’t cost you more than a few dozen yuan in extra expense, but before buying one, verify three key details: the start date of coverage (most start on the purchase date, so the first few years overlap with the statutory warranty), whether the warranty is provided by the retailer, the brand manufacturer, or a third-party provider, and whether there are extra charges for on-site service or replacement parts. It’s also worth checking the product manual and original warranty card, as some brands offer longer coverage periods than the statutory minimum.