If you get an All-in-One computer, like an iMac, you don't need any extras to get started. However, if you're buying a desktop tower - like most of the PCs on our list - then you'll need extra equipment.
Monitor - Unless you plug your PC into the TV, which we don't recommend as a full-time solution for anything other than it being a media center, you'll need a monitor. Most PC monitors start around 24 inches and can go well past 32 inches. We think the sweet spot is a 27-inch monitor for most home offices. Almost all monitors are Full HD ready now, so they will display up to 1080p, which is fine for anything except higher-demand tasks like video and photo editing and high-end gaming. For these, you may need either a higher-refresh monitor or a 4K screen. Monitors start at just over $100 and run to... well, over $2000 for the mega gaming screens.
Keyboard - Yeah, you'll need a keyboard for your desktop, too. Happily, you can get a wired keyboard and mouse combo for around $25, which is only a little extra on top of your PC purchase. Most manufacturers offer the chance to bundle a keyboard and mouse when you buy a desktop, so we suggest you just do that.
Mouse - As mentioned above, you'll also need a mouse, but they can be easily bundled with a keyboard at a little extra expense when you buy. While you'll probably be fine with a wired keyboard, we do think it's worth paying a little extra for a wireless mouse to eliminate the tangle of wires.
Cables - While most PCs come with all the cables you need, it's worth considering whether or not you need to plug anything else in. Some monitors include an HDMI, for example, but not all do. If you want to plug into your router for a wired connection, you'll need an ethernet cable to do that.
Router - While almost all households have a router nowadays, it should be mentioned that you can't access the internet without one, so make sure you have a router when you buy your PC. We have a list of the best wireless routers if you need them, although most internet providers will bundle one with their subscription plans.
Webcam - While some All-in-One computers come with built-in webcams, and some monitors have them, you'll likely need a separate camera if you want to take part in video calls or record yourself. Again, we have a guide to the best webcams, and they really aren't all that expensive.
Printer - This isn’t a necessity, but a printer is a great addition to your home office setup. A good all-in-one printer will let you print, scan, and copy documents from the comfort of your own home - ideal when you’re working from home. If you’re short on space, you could get a compact printer, while photography buffs can benefit from a photo printer to make the most of your camera work.