If you have a propensity for writing and you can slay with your prose, consider writing an ebook. While the market has certainly become saturated as of late, books that help teach people about a technical topic still sell extremely well. This is a great source of passive income but does require a large amount of effort at the outset before any money is generated.
The Balance Sheet is a snapshot summary of the assets, liabilities, and equity of your business at a particular point in time. For a startup, this would be on the day the business opens. Note that a new business will have no accounts receivable entries on the balance sheet. Note also that the Balance Sheet is much simpler for unincorporated businesses without employees. Income tax, pensions, medical, etc. are only applicable to incorporated businesses, as are Earnings/Retained Earnings.
I have another to add to your list that’s almost as easy to do as going for a daily walk! Clean up litter outside commercial properties for property management companies. The work is done on foot using simple hand tools. I started this as a side gig in 1981 and grew it into a profitable full-time business that I continue to operate today. I share my experience in my book, Cleanlots, and offer free support.
There’s plenty of work and clients to be found. If you know where to look. To start, you need to know if there is enough demand for your skill to make it worth the effort to go out looking for work. Start by searching for freelance postings on sites like Flexjobs, SolidGigs, Contena, greatcontent or one of the dozens of other skill-specific freelance job boards.
How many email newsletters are you bombarded with every single day? There’s a reason for that. Marketing to an actively interested group of email subscribers is one of the best ways to make money online. There have even been million-dollar businesses built from simple email newsletters like TheSkimm, or Mister Spoils. Each newsletter targets a specific type of user with interesting, daily content, while also partnering with relevant companies and affiliates to bring in extra money. If this seems daunting, it’s not. Tools like MailChimp, ConvertKit, HubSpot and AWeber make it easier than ever to get started with email marketing. And another great option to consider (with the largest free plan available) is SendPulse, with their ability to send up to 15,000 emails per month to 2,500 subscribers, and then affordable plans starting at under $10/month as you grow from there.
Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop.
You can sell your ebooks through Amazon's Kindle program or Apple's iTunes Connect, which gives you access to a large majority of the digital-book reading market and the barriers for entry are incredibly low. You don't need to invest lots of money to make this happen, but you do need to invest lots of time, not only in writing the ebooks, but in marketing them as well.