diff --git a/test/controllers/simplefin_items_controller_test.rb b/test/controllers/simplefin_items_controller_test.rb
new file mode 100644
index 000000000..9f395a243
--- /dev/null
+++ b/test/controllers/simplefin_items_controller_test.rb
@@ -0,0 +1,45 @@
+require "test_helper"
+
+class SimplefinItemsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in users(:dylan)
+    @family = families(:dylan_family)
+    @simplefin_item = SimplefinItem.create!(
+      family: @family,
+      name: "Test Connection",
+      access_url: "https://example.com/test_access"
+    )
+  end
+
+  test "should get index" do
+    get simplefin_items_url
+    assert_response :success
+    assert_includes response.body, @simplefin_item.name
+  end
+
+  test "should get new" do
+    get new_simplefin_item_url
+    assert_response :success
+  end
+
+  test "should show simplefin item" do
+    get simplefin_item_url(@simplefin_item)
+    assert_response :success
+  end
+
+  test "should destroy simplefin item" do
+    assert_difference("SimplefinItem.count", 0) do # doesn't actually delete immediately
+      delete simplefin_item_url(@simplefin_item)
+    end
+
+    assert_redirected_to simplefin_items_path
+    @simplefin_item.reload
+    assert @simplefin_item.scheduled_for_deletion?
+  end
+
+  test "should sync simplefin item" do
+    post sync_simplefin_item_url(@simplefin_item)
+    assert_redirected_to simplefin_item_path(@simplefin_item)
+    assert_equal "Sync started", flash[:notice]
+  end
+end
diff --git a/test/models/simplefin_account_test.rb b/test/models/simplefin_account_test.rb
new file mode 100644
index 000000000..012366152
--- /dev/null
+++ b/test/models/simplefin_account_test.rb
@@ -0,0 +1,77 @@
+require "test_helper"
+
+class SimplefinAccountTest < ActiveSupport::TestCase
+  setup do
+    @family = families(:dylan_family)
+    @simplefin_item = SimplefinItem.create!(
+      family: @family,
+      name: "Test SimpleFin Connection",
+      access_url: "https://example.com/access_token"
+    )
+    @simplefin_account = SimplefinAccount.create!(
+      simplefin_item: @simplefin_item,
+      name: "Test Checking Account",
+      account_id: "test_checking_123",
+      currency: "USD",
+      account_type: "checking",
+      current_balance: 1500.50
+    )
+  end
+
+  test "belongs to simplefin_item" do
+    assert_equal @simplefin_item, @simplefin_account.simplefin_item
+  end
+
+  test "validates presence of required fields" do
+    account = SimplefinAccount.new
+    refute account.valid?
+
+    assert_includes account.errors[:name], "can't be blank"
+    assert_includes account.errors[:account_type], "can't be blank"
+    assert_includes account.errors[:currency], "can't be blank"
+  end
+
+  test "validates balance presence" do
+    account = SimplefinAccount.new(
+      simplefin_item: @simplefin_item,
+      name: "No Balance Account",
+      account_id: "no_balance_123",
+      currency: "USD",
+      account_type: "checking"
+    )
+
+    refute account.valid?
+    assert_includes account.errors[:base], "SimpleFin account must have either current or available balance"
+  end
+
+  test "can upsert snapshot data" do
+    snapshot = {
+      balance: 2000.00,
+      available_balance: 1800.00,
+      currency: "USD",
+      type: "savings",
+      subtype: "savings",
+      name: "Updated Savings Account",
+      id: "updated_123"
+    }
+
+    @simplefin_account.upsert_simplefin_snapshot!(snapshot)
+
+    assert_equal 2000.00, @simplefin_account.current_balance
+    assert_equal 1800.00, @simplefin_account.available_balance
+    assert_equal "savings", @simplefin_account.account_type
+    assert_equal "Updated Savings Account", @simplefin_account.name
+    assert_equal snapshot, @simplefin_account.raw_payload
+  end
+
+  test "can upsert transactions" do
+    transactions = [
+      { id: "txn_1", amount: -50.00, description: "Coffee Shop", posted: "2024-01-01" },
+      { id: "txn_2", amount: 1000.00, description: "Paycheck", posted: "2024-01-02" }
+    ]
+
+    @simplefin_account.upsert_simplefin_transactions_snapshot!(transactions)
+
+    assert_equal transactions, @simplefin_account.raw_transactions_payload
+  end
+end
diff --git a/test/models/simplefin_item_test.rb b/test/models/simplefin_item_test.rb
new file mode 100644
index 000000000..30a429867
--- /dev/null
+++ b/test/models/simplefin_item_test.rb
@@ -0,0 +1,64 @@
+require "test_helper"
+
+class SimplefinItemTest < ActiveSupport::TestCase
+  setup do
+    @family = families(:dylan_family)
+    @simplefin_item = SimplefinItem.create!(
+      family: @family,
+      name: "Test SimpleFin Connection",
+      access_url: "https://example.com/access_token"
+    )
+  end
+
+  test "belongs to family" do
+    assert_equal @family, @simplefin_item.family
+  end
+
+  test "has many simplefin_accounts" do
+    account = @simplefin_item.simplefin_accounts.create!(
+      name: "Test Account",
+      account_id: "test_123",
+      currency: "USD",
+      account_type: "checking",
+      current_balance: 1000.00
+    )
+
+    assert_includes @simplefin_item.simplefin_accounts, account
+  end
+
+  test "has good status by default" do
+    assert_equal "good", @simplefin_item.status
+  end
+
+  test "can be marked for deletion" do
+    refute @simplefin_item.scheduled_for_deletion?
+
+    @simplefin_item.destroy_later
+
+    assert @simplefin_item.scheduled_for_deletion?
+  end
+
+  test "is syncable" do
+    assert_respond_to @simplefin_item, :sync_later
+    assert_respond_to @simplefin_item, :syncing?
+  end
+
+  test "scopes work correctly" do
+    # Create one for deletion
+    item_for_deletion = SimplefinItem.create!(
+      family: @family,
+      name: "Delete Me",
+      access_url: "https://example.com/delete_token",
+      scheduled_for_deletion: true
+    )
+
+    active_items = SimplefinItem.active
+    ordered_items = SimplefinItem.ordered
+
+    assert_includes active_items, @simplefin_item
+    refute_includes active_items, item_for_deletion
+
+    assert_equal [ @simplefin_item, item_for_deletion ].sort_by(&:created_at).reverse,
+                 ordered_items.to_a
+  end
+end