Newegg offers the H&R Block 2018 Deluxe + State Tax Software for PC / Mac with a $10 Newegg Gift Card for $39.99. Coupon code "EMCTWTD43" drops that to $19.99. With free shipping via Shoprunner and assuming you'll use the gift card, that's $13 under our February mention and the best deal we could find today by $9. This software includes five free federal e-files and can be installed via CD or download. Note: Don't have a ShopRunner membership? It's free to sign up. Also, you can also get the H&R Block 2018 Premium Tax Software for PC / Mac with a $10 Newegg GC for $29.99 via the same coupon with free shipping.
Uncle Sam could take a hefty chunk of your retirement income if you botch this.