A backlink's impact on domain authority depends on three variables: the authority of the linking domain, your site's current DA, and how many total backlinks you already have. If you're at DA 15 and earn a link from a DA 60 news site, you might jump 1.5–2 points. That same link to a DA 55 site might move the needle 0.2 points or less. DA uses a logarithmic scale, so early gains come fast and later gains require exponentially more effort. Moving from DA 10 to 20 might take 15–25 decent links. Moving from DA 40 to 50 can take hundreds of links from similarly authoritative sources. We see this across our portfolio—new domains hit DA 20–25 within six months with moderate link building, but pushing past DA 45 takes sustained campaigns over 18–24 months. Not all backlinks register. Moz recalculates DA based on links in their index, which updates roughly monthly but doesn't capture every link Google sees. A backlink from a brand-new site with DA 1 contributes almost nothing. Links from spammy directories or PBNs can actually correlate with DA drops if Moz's spam detection flags the neighborhood your links come from. Relevance and anchor diversity matter more than raw DA movement. A contextual link from a DA 35 industry blog often drives more organic traffic and ranking improvement than a sidebar link from a DA 60 generic news site. At Ottawa SEO we track DA as a portfolio health metric, but we optimize link campaigns for relevance, traffic potential, and editorial quality first. A campaign that moves DA by 5 points but brings zero referral traffic usually underperforms one that moves DA by 2 points and sends qualified visitors. Expect 3–6 months before you see meaningful DA changes from a new link building push. Moz's crawlers need time to discover links, and DA reflects your entire backlink profile, so individual links get averaged into a larger picture. Focus on building 5–10 quality links per quarter rather than obsessing over each fractional DA tick.